CSS transitions create smooth property changes over time, enhancing user experience in web applications. Basic syntax includes property, duration, timing-function, and delay, with examples including fading elements, animating color, and transforming elements. Advanced techniques involve chaining transitions and delaying starts for complex animations.
TL;DR Mastering CSS Gradients: Unlocking Linear and Radial Background Magic. Learn to create smooth transitions between colors using linear and radial gradients, exploring syntax, techniques, and tricks for adding depth and visual appeal to designs. Discover how to specify direction, color stops, shape, size, and position, as well as advanced techniques like repeating gradients, gradient borders, and gradient text. Mastering CSS Gradients: Unlocking Linear and Radial Background Magic As a fullstack developer, you're likely no stranger to the world of CSS. One of the most powerful tools in your styling arsenal is the humble gradient.
The calc function in CSS enables dynamic calculations within property values, supporting mathematical operations on lengths, numbers, or percentages with a basic syntax of `width: calc(expression)`, and is useful for responsive layouts, dynamic spacing, and fluid typography.
CSS masking allows hiding parts of elements creatively by applying a mask, which can be an image, gradient, or other HTML element. It enables complex shapes and cutouts using properties like `mask-image` and `mask-position`, with additional features like `mask-size` and `mask-layer`. Examples include circular image cutouts, gradient reveals, and element masking for unique visual effects.
CSS custom properties allow developers to define reusable values that can be used throughout a stylesheet, making it easy to maintain consistency and improve code readability. They're defined using the `--` prefix and can be referenced using the `var()` function, offering advantages like reusing values, easy updates, and improved readability.
CSS Clip Path allows you to define a region of an element that should be visible or clipped, creating custom shapes like circles, ellipses, polygons, and more complex designs using flexible syntax and advanced techniques such as animation and transitions.
Mastering important declarations in CSS can be tricky, but understanding how they interact with specificity is key to wielding their power. Important declarations override normal styles, while specificity determines which styles get applied based on selector type and quantity. Using `!important` sparingly and considering selector specificity scores helps write more effective and maintainable CSS.
CSS blend modes combine element colors to create unique visual effects using the `mix-blend-mode` property, offering a range of possibilities for creating stunning web applications with 12 different blend modes, including multiply, screen, and overlay.
CSS inheritance allows child elements to inherit styles from parent elements, simplifying styling and reducing code duplication. Properties like color and font-family are inherited by default, while others require explicit inheritance or have specific behavior when it comes to inheritance. Understanding the inheritance cascade and using utility classes can help unlock CSS inheritance's full potential for efficient and effective styling.
TL;DR CSS filter effects like blur, brightness, and contrast allow developers to manipulate images and text with precision, unlocking new levels of visual sophistication and user experience. By mastering these techniques, developers can elevate their designs and deliver exceptional results for clients, while also setting themselves apart from the competition. Unlocking the Power of CSS Filter Effects: A Deep Dive into Blur, Brightness, and Contrast As a fullstack developer, you're likely no stranger to the world of CSS styling. But even with its ever-growing list of features and functionalities, CSS can sometimes feel like a limiting factor in our quest for visual creativity. That is, until we delve into the realm of filter effects.
CSS specificity determines which CSS rules apply to an element when multiple rules match. It's calculated by assigning weights to different types of selectors: inline styles (1000 points), IDs (100 points), classes and attributes (10 points), and elements (1 point). Understanding CSS specificity helps resolve conflicts between different CSS selectors.
Mastering CSS animations involves defining keyframe animations with specific styles at various points in time. Keyframes are defined using `@keyframes` rule and applied to elements using properties like `animation-name`, `animation-duration`, and `animation-iteration-count`. Combining multiple keyframes and animation properties creates complex animations that enhance user experience and engagement.
Mastering CSS combinators simplifies stylesheets and improves performance. Descendant selectors target elements within another element, while child selectors select immediate children. Sibling selectors come in two flavors: adjacent and general. Combining these selectors creates powerful styles with real-world use cases including styling navigation menus, creating responsive layouts, and customizing form elements.
Mastering CSS Transforms can take your web development skills to the next level. This article explores translate, rotate, scale, and skew functions, providing comprehensive examples and tricks for creating dynamic user experiences. By combining multiple transform functions, developers can achieve sophisticated results with minimal code.
Mastering CSS Word Spacing: Adjusting Space Between Words like a Pro. CSS word spacing refers to space between words in block text, measured in units like pixels or ems. The `word-spacing` property adjusts this space with values including `<length>` or `normal`, used for better readability or compact look.
Mastering CSS max-width and max-height is crucial for creating responsive web applications that adapt seamlessly to various screen sizes and devices, ensuring designs remain readable and well-structured across different platforms.
CSS letter spacing adjusts space between characters in text, improving readability or creating visual interest. The `letter-spacing` property controls it with values like length units (`px`, `em`) and keywords (`normal`, `inherit`). Positive values increase character space, while negative decreases it.
Pseudo-elements are fictional elements that can be used to style specific parts of an HTML element, allowing developers to add content before or after an element's actual content using `::before` and `::after`.
Mastering CSS line height is crucial for controlling vertical spacing between lines of text, affecting readability and design aesthetic. Best practices include setting a default value between 1.4 and 1.6, maintaining a consistent ratio to font size, and applying it throughout the text for visual cohesion.
Mastering CSS pseudo-classes like :hover, :focus, and :active allows developers to apply styles based on specific states or conditions, creating dynamic effects and enhancing user experience. These pseudo-classes can be used individually or combined to achieve complex styles and effects, taking web development skills to the next level.
Mastering CSS font properties is essential for creating visually appealing and readable content on the web. The `font-family` property specifies typeface, while `font-size` controls text size using units like pixels or ems, and `font-weight` defines boldness. Combining these properties creatively elevates typography and user experience.
Mastering CSS text transformation can elevate typography with `uppercase`, `lowercase`, and `capitalize` properties, creating attention-grabbing headings, conveying informality, or adding sophistication to text content.
Styling Forms with CSS: A Comprehensive Guide for Fullstack Developers. Learn techniques for styling input fields and buttons, including basic styling, customizing borders and states, and using pseudo-elements and animations. Expert tips include using box-sizing, flexbox or grid layouts, media queries, and experimenting with custom fonts and colors to create visually appealing and user-friendly interfaces.
CSS text decoration properties like `underline`, `overline`, and `line-through` can greatly impact user experience and readability in web design, with options for customization and best practices to ensure accessibility and sufficient contrast between text and background.
Mastering CSS text alignment is crucial for web development, impacting user experience and visual appeal. There are four primary options: left, center, right, and justify, as well as additional properties like word-wrap and hyphens that refine typography. Understanding these options can help create visually appealing interfaces.
Mastering CSS tables involves styling borders and spacing for a visually appealing layout, using techniques such as adding simple borders, customizing colors and widths, creating rounded corners, controlling table spacing with padding or border-spacing, and making tables responsive with relative units and media queries.
Mastering CSS overflow prevents unwanted scrollbars or awkwardly cropped text when content exceeds container size, using properties like `visible`, `hidden`, `scroll`, and `auto`, as well as custom scrollbars with CSS pseudo-elements, to build responsive layouts and UI components.
Customizing HTML lists with CSS can elevate a web application's visual experience using techniques like list-style-image, pseudo-elements, Unicode characters, counters, and CSS Grid to create custom bullet points and numbering, allowing developers to match their brand's style and deliver high-quality user experiences.
Mastering min-width and min-height is crucial for responsive layouts. These properties set minimum widths and heights, ensuring elements aren't too small. Techniques like overflow: auto, combining with flex-basis, and leveraging the minmax() function in Grid can help overcome challenges.
Mastering CSS white space and text wrapping behavior is essential for fullstack developers, with the `white-space` property having five values: normal, nowrap, pre, pre-line, and pre-wrap, and additional techniques including `word-break`, `overflow-wrap`, and `hyphens` properties to control how words are broken and hyphenated.
CSS Grid is a layout system that allows for two-dimensional grid-based layouts with ease. It's based on a grid container that defines the structure and dimensions, while grid items are placed within it according to specific rules. With its flexible syntax and advanced features, CSS Grid enables the creation of complex, adaptable layouts.
Mastering CSS width and height is crucial for layout control in web development, involving understanding various units and properties. Expert tricks include using max-width instead of width for responsive design, taking advantage of viewport units, and considering box-sizing to avoid common pitfalls and create flexible layouts.
TL;DR CSS Flexbox is a powerful tool for creating flexible, one-dimensional layouts. It allows you to arrange elements in a container in a flexible way, making it easy to create responsive designs with minimal code. With key concepts like flex containers, flex items, main axis, and cross axis, you can master Flexbox properties like display, flex-direction, justify-content, and align-items. By understanding these basics and advanced techniques, you'll be able to create stunning, adaptable layouts that work seamlessly across different screen sizes and devices. Mastering CSS Flexbox: Unlocking Flexible One-Dimensional Layouts As a fullstack developer, you're likely no stranger to the world of CSS layout management.
CSS padding is the space between an element's content and its border, affecting readability, user experience, and design aesthetics. Mastering padding enables responsive designs, dynamic element sizing, and precise control over spacing using various units and properties.
Mastering CSS Clear: Controlling Element Behavior after Floats. The `clear` property specifies whether an element should be moved below a floated element or not, accepting values of none, left, right, and both, essential for creating complex layouts with confidence in traditional float-based layouts and modern flexbox and grid systems.
Mastering CSS Margins is crucial for creating visually appealing and well-structured web applications. It creates space outside element borders, controlled by four properties: margin-top, margin-right, margin-bottom, and margin-left. Techniques like margin collapsing, negative margins, and margin auto help craft complex layouts that adapt to different viewports.
Mastering CSS Floats allows developers to create unique layouts and text wraps around images by taking elements out of the normal document flow and placing them left or right, with other elements wrapping around them. The `float` property accepts two values: `left` and `right`.
Mastering CSS borders is crucial for a great user experience. Learn about border styles (solid, dotted, dashed), widths (px, em, rem), colors (hex, rgb, hsl), and expert tricks like diagonal borders, multi-colored borders, and border overlap effects to enhance your design skills.
The CSS `position` property has four main values: `static`, `relative`, `absolute`, and `fixed`. Understanding these values is key to mastering layout control on web pages, allowing for adjustments to an element's position without disrupting surrounding elements or creating complex layouts and overlays.
Mastering CSS backgrounds is crucial for creating visually appealing web applications. Learn how to use background images, colors, and positions with techniques such as repeat, size, position, attachment, and combining multiple backgrounds with pseudo-elements, linear gradients, radial gradients, and background clipping.
Mastering CSS fundamentals is crucial for fullstack developers, particularly understanding the `display` property and its three main values: `block`, `inline`, and `inline-block`. Each value controls how an element is displayed on a webpage, with distinct use cases and practical applications in building visually appealing and functional web applications.
Mastering CSS colors is essential for fullstack developers to create stunning web applications using hex, RGB, RGBA, and named values, as well as CSS color functions like HSL and RGBA to create new colors or modify existing ones.
The CSS box model consists of four primary elements: content area, padding, border, and margin. Mastering these components is crucial for creating robust and maintainable layouts. Understanding the relationships between them helps developers tackle complex design challenges with confidence.
Mastering responsive design with CSS media queries enables adaptive layouts for varying screen sizes, orientations, and resolutions, delivering exceptional user experiences. Key takeaways include using a mobile-first approach, identifying breakpoints, and keeping media queries organized and scalable.
Mastering CSS selectors is crucial for building robust front-end applications. Understanding type, class, ID selectors, attribute selectors, pseudo-classes, and pseudo-elements can take your styling skills to new heights.
The global undefined value in JavaScript is not a primitive value, but rather a property of the global object, which can lead to confusion and unexpected behavior if not understood. Grasping its implications helps avoid common pitfalls, write more maintainable code, and ensures applications run smoothly.
Mastering regex is crucial for fullstack developers working with text data. The RegExp object in JavaScript allows creation, testing, and manipulation of regex patterns using literal notation or the constructor function, with flags like `g` (global) and `i` (case-insensitive). Essential regex patterns include `.` (any single character), `\w` (word character), and `^` (start of string).
Understanding infinity (∞) and negative infinity (-∞) is crucial for fullstack developers to build robust applications and handle errors effectively. In JavaScript, `Infinity` and `-Infinity` are special values that can be obtained using the `Math` object. They represent quantities with no end or limit, and decrease without bound respectively. Knowing how they behave in mathematical operations, such as arithmetic and comparisons, is essential for handling infinite values correctly in real-world scenarios like validation, mathematical calculations, and error handling.
Mastering CSS syntax is crucial for fullstack developers to build visually stunning web applications. A CSS ruleset consists of a selector and declaration block, defining styles for HTML elements with properties, values, and separators. Grouping declarations reduces code duplication, while nested rulesets apply styles to specific elements within a larger context.
JavaScript's `NaN` value represents an invalid or unreliable result from a mathematical operation, often created by division by zero, invalid numeric conversions, or operations with special values like `Infinity`. It has unique properties that make it challenging to work with. To handle `NaN`, validate user input, use `isNaN()` or `Number.isNaN()`, and be cautious with comparisons.
Truthy values in JavaScript are all non-falsy values, including objects, arrays, functions, and strings with content, which evaluate to `true` in conditional statements. Understanding this concept is crucial for writing robust code, using explicit comparisons, checking for null or undefined, and being mindful of empty strings to avoid unexpected behavior.
The `isFinite()` function attempts to convert its argument to a number, whereas `Number.isFinite()` only accepts numeric values, making it more type-sensitive and suitable for most use cases, especially when type sensitivity is crucial.
JavaScript's 6 falsy values are `false`, `0`, empty string, `null`, `undefined`, and `NaN`. Understanding them is crucial for writing clean code and avoiding errors. Use strict equality checks and test for falsiness explicitly to work with them effectively.
JavaScript has two functions to detect NaN values: `isNaN()` and `Number.isNaN()`. While similar, they differ in how they handle non-numeric values. `isNaN()` converts values to numbers before checking if they're NaN, while `Number.isNaN()` strictly checks for existing NaN numbers.
The `void 0` idiom is used to reliably represent `undefined` in JavaScript code, as an alternative to using the `undefined` keyword directly, which can be reassigned or overwritten in certain environments.
JavaScript's `parseInt()` and `parseFloat()` functions help extract numeric values from strings, with key differences in radix specification, leading zero handling, and performance. Best practices include specifying radix, using `parseFloat()` for decimals, and validating user input to handle complex numerical parsing tasks effectively.
TL;DR Short-circuit evaluation with && and || improves JavaScript performance, reduces errors, and enhances readability by avoiding unnecessary evaluations in conditional statements and logical expressions. Short-circuit evaluation with && and ||: A Game-Changer for Fullstack Developers As a fullstack developer, having a deep understanding of JavaScript is crucial to creating robust and efficient applications. One fundamental concept in JavaScript that can greatly impact your code's performance and readability is short-circuit evaluation using the logical operators && and ||.
JavaScript's `toFixed()`, `toPrecision()`, and `toString()` methods offer powerful tools for manipulating numerical values, helping developers tackle complex tasks involving numbers, such as rounding decimal values or converting numbers to strings in various bases. Mastering these methods can elevate skills and create more efficient applications.
JavaScript has six empty values that can be tricky to work with: "", 0, null, undefined, NaN, and false. Each value has its own quirks when used in conditional statements, coercions, or comparisons, making it crucial for fullstack developers to understand their subtleties to write robust code.
JavaScript has three string extraction methods: `slice()`, `substring()`, and `substr()`. `Slice()` is the most versatile, taking a start index (inclusive) and an end index (exclusive), with support for negative indices.
JavaScript's boolean conversion rules determine if non-boolean values become true or false. Numbers (except 0), non-empty strings, objects, arrays, and functions are true; null and undefined are false; booleans remain unchanged. Understanding these rules is crucial for writing robust code, especially in conditional statements and user input validation.
Mastering String Searching in JavaScript: A Fullstack Developer's Guide covers four essential methods: `indexOf()`, `includes()`, `startsWith()`, and `endsWith()` for efficient string searching, improving code readability and performance in web applications, mobile apps, and desktop programs.
JavaScript's global null value allows accessing properties on the global object without throwing an error, leading to unexpected behavior if not handled properly. Understanding how it works can help write more robust code by using strict mode, checking for null/undefined, and leveraging optional chaining.
Mastering JavaScript string methods is crucial for fullstack developers. Essential methods include `toUpperCase()`, converting text to uppercase; `toLowerCase()`, converting text to lowercase; and `trim()`, removing whitespace from strings, standardizing user input, making text more readable, and cleaning up data.
The eval() function in JavaScript executes strings as code at runtime, but poses security concerns like code injection attacks and XSS vulnerabilities. It's useful for dynamic code execution and mathematical expressions, but use it safely by sanitizing input and running it in a sandboxed environment.
Custom error types in JavaScript improve code readability, provide better error handling, and enhance debugging experiences by adding context and specificity to error messages, making code more robust and maintainable.
Mastering the Date object is crucial for fullstack developers to deliver accurate and user-friendly experiences. Dates can be created using constructors, timestamps, or individual components, and manipulated with methods like setFullYear and setMonth. JavaScript provides several formatting methods, including toLocaleString and toISOString, and parsing strings into dates with Date.parse.
The `throw` statement in JavaScript allows developers to create and throw custom errors, providing more context and information about what went wrong in the code. Custom error classes can be created by extending the built-in `Error` class, enabling differentiation between types of errors. Best practices include being specific with error messages, using custom error classes, and not overusing the `throw` statement.
The `finally` block in JavaScript ensures code runs every time, regardless of errors, preventing resource leaks and memory issues by releasing external resources like files, network connections, or databases after use.
JavaScript's built-in Math object provides access to mathematical functions and constants, including trigonometric methods, exponential and logarithmic calculations, rounding and remainder operations, and more. Understanding its properties and methods can simplify code, improve performance, and tackle complex problems with ease.
Try-catch blocks are error-handling constructs in JavaScript that execute code while anticipating potential errors, improving error handling and enhancing the user experience by writing robust code that anticipates potential errors.
JavaScript's encoding/decoding mechanisms can lead to URI errors if not used correctly. Proper use of `encodeURIComponent()` and `decodeURIComponent()` is crucial for building robust and secure applications, preventing errors and security vulnerabilities such as cross-site scripting attacks. Common mistakes include misusing `escape()`, failing to encode query parameters, and decoding URIs incorrectly.
The `delete` operator in JavaScript removes object properties with ease, making them inaccessible by removing them from the object's property list. Its syntax is straightforward: `delete object.property;`. Useful for removing sensitive data, cleaning up temporary properties, and simplifying complex objects.
Range errors occur in JavaScript when numbers exceed their maximum or minimum allowed value, often due to arithmetic overflows, integer overflow, or floating-point precision issues. Strategies for preventing range errors include using typed arrays, validating user input, and employing robust arithmetic libraries like `decimal.js` or `big-integer`.
The `instanceof` operator checks if an object is an instance of a specified constructor function or class in JavaScript, returning a boolean value by traversing the prototype chain, useful for type checking in conditional statements and validating user input.
JavaScript's dynamic typing can lead to sneaky type errors when performing operations on values with unexpected data types, resulting in unexpected behavior or runtime errors. Use strict equality, check types explicitly, and utilize linters and code analyzers to catch errors early on.
The "in" operator in JavaScript checks if a property exists in an object, returning a boolean value. It helps avoid TypeError when accessing non-existent properties, enables dynamic property access, and simplifies array iteration with sparse elements, making it essential for writing robust and efficient code.
TL;DR A ReferenceError occurs when trying to use an undeclared or undefined variable in JavaScript. Causes include typos, missing declarations, out-of-scope variables, and missing imports. To troubleshoot, check variable names, verify declarations, review scope, and inspect imports. Following best practices like using linters, consistent naming conventions, and understanding scoping rules can help avoid ReferenceErrors. Reference errors: When variables don't exist As a Fullstack Developer, you've likely encountered your fair share of errors in JavaScript. One type of error that can be particularly frustrating is the ReferenceError. In this article, we'll delve into what ReferenceErrors are, why they occur, and how to troubleshoot them.
The comma operator in JavaScript evaluates multiple expressions within a single statement, discarding the left-hand operand's result and returning the right-hand operand's value, allowing for concise code but should be used sparingly to avoid making code harder to read.
JavaScript has two types of errors: syntax errors and runtime errors. Syntax errors occur due to mistakes in code writing, preventing execution, while runtime errors happen during execution, often caused by unexpected interactions or edge cases, leading to application failure. Understanding the difference is crucial for robust coding.
The void operator in JavaScript evaluates an expression and returns undefined, but has practical uses such as preventing default behavior, specifying expressions, and type casting, making it a valuable tool for fullstack developers to improve their coding skills.
JavaScript's Error objects contain valuable information about errors, including message, name, and stack properties, aiding in identifying issues, debugging code, and writing robust error handling logic.
Mastering JavaScript's basic array methods, including `push()`, `pop()`, `shift()`, and `unshift()`, is crucial for manipulating arrays with ease, allowing developers to add or remove elements from the beginning or end of an array, modifying existing data and creating complex structures.
JavaScript's scope chain is crucial for building robust applications. A scope refers to the region where variables and functions are defined and can be accessed, with two primary types: global and local. Nested functions create a scope chain, where variables are resolved by searching up the chain from inner to outer scopes. Understanding lexical scoping and best practices like organizing code and minimizing global variables can help developers master JavaScript's scope chain.
Lexical scoping helps JavaScript find variables by defining accessibility scope using a combination of global, function, and block scopes, and closures to search for variables in local, outer, and global scopes.
The `debugger` statement is a simple yet powerful tool for debugging JavaScript applications, allowing developers to pause execution at specific points, gain deeper insights into code, identify issues efficiently, and improve productivity.
Mastering block scope in JavaScript is crucial for efficient code. `let` and `const` introduced block scope, avoiding unexpected behavior and bugs. Key differences include `let` allowing reassignment and `const` not allowing it. Best practices: use `const` by default and avoid `var`.
JavaScript's strict mode enhances code quality, security, and performance by enforcing best practices, preventing common mistakes, and catching errors earlier. Adding `'use strict'` to files enables this feature, which can be used globally or within specific sections of code. Strict mode prevents implicit global variables, disallows octal literals, and throws more informative error messages.
JavaScript's semicolon auto-insertion feature makes them optional in many cases, but they're still required to avoid statement concatenation errors and when using Immediately Invoked Function Expressions (IIFE). Semicolons are automatically inserted at the end of a line, file, or after return, throw, and break statements without intervening tokens.
Function scope in JavaScript refers to the region where variables defined inside a function can be accessed, creating a local environment that maintains code organization and prevents variable name collisions. There are two primary types of function scopes: global scope and local scope (function scope), each with its own rules for accessing and declaring variables.
Comments are crucial for clean, readable, and maintainable JavaScript code, serving as a roadmap to help others understand the logic behind it. They explain complex functions, provide context, document API endpoints, and leave notes for future development or debugging.
In JavaScript, every variable lives within a specific scope. The global scope contains all other scopes, making variables declared in it accessible from anywhere, but introducing potential issues with collisions, namespace pollution, and security vulnerabilities. Best practices include using `var`, `let`, or `const` keywords, utilizing modules or closures, and minimizing global variable usage to write cleaner code.
In JavaScript, `const` prevents reassignment of a variable, not modification of its contents, especially with objects and arrays. To achieve true immutability, techniques like Object.freeze() or Immutable.js are needed.
Computed property names in JavaScript objects improve readability and maintainability by allowing dynamic computation of property names using expressions wrapped in square brackets `[]`. Introduced in ECMAScript 2015 (ES6), this feature enables dynamic property creation, improves code readability, and reduces errors, with use cases including API data mapping, internationalization, and data normalization.
The `with` statement in JavaScript was introduced to simplify code but has been deprecated due to ambiguity, performance issues, and security concerns. Use object destructuring or direct property access for more efficient, readable, and secure code.
ES6 introduced object method shorthand, allowing developers to define methods within objects using a concise syntax, making code more expressive and easier to maintain. This feature simplifies development, improves performance, and enhances readability, promoting consistency and reducing repetition.
Implicit global variables in JavaScript can cause problems like name collisions, scope pollution, security risks, and reduced code readability. To avoid these issues, use `var`, `let`, or `const` declarations, enable strict mode, and utilize a linter or code analyzer to detect and prevent implicit global variables.
Multi-dimensional arrays in JavaScript unlock new levels of data manipulation and storage, ideal for complex relationships or hierarchical structures, useful in tabular data, games, matrix operations, and data visualizations.
The global object in JavaScript is the top-most scope for variables, functions, and objects, represented by the `window` object in browsers. Variables declared outside of any function or block scope are attached to it, posing security risks if not managed properly.
The .length property in JavaScript returns the number of elements in an array, essential for looping, indexing, and using array methods. Access the .length property to get an array's length: `const colors = ['red', 'green', 'blue']; console.log(colors.length); // Output: 3`.
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