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What Are JavaScript Modules? Modules are reusable pieces of code that can be exported from one file and imported into another. They allow you to: Types of JavaScript Modules Exporting and Importing in ES6 Modules 1) Exporting Code: You can export functions, objects, or variables from a module to make them available in other files. … Read more
What Are JavaScript Classes? A class in JavaScript is a blueprint for creating objects. It encapsulates data (properties) and behaviors (methods) into a single entity. Classes bring OOP concepts like inheritance, encapsulation, and abstraction into JavaScript. Defining a Class You can define a class using the class keyword. Syntax: class ClassName { constructor(parameters) { // … Read more
What Are Arrow Functions? Arrow functions simplify the syntax, making your code cleaner and more readable. Unlike traditional functions, arrow functions do not have their own this, which can lead to intuitive behavior in certain contexts like callbacks and event handlers. Arrow functions are a shorthand syntax for defining functions. They are particularly useful for: … Read more
What Is the this Keyword? The this keyword is a special identifier in JavaScript used to reference an object. It dynamically determines its value based on how and where the function or code is executed. In simple terms: Behavior of this in Different Contexts 1. Global Context In the global execution context, this refers to … Read more
What Is Strict Mode? Strict mode is a feature introduced in ECMAScript 5 (ES5). It makes JavaScript behave in a stricter way by restricting certain actions and throwing errors for unsafe practices. Strict mode can be enabled for the entire script or specific functions. When active, it helps developers avoid pitfalls like accidental global variables … Read more
What Is Hoisting? In JavaScript, hoisting is the default behavior of moving variable and function declarations to the top of their containing scope (script or function). Only declarations are hoisted—not the assignments. This means that variables and functions can be used before they are declared, but their values may not be accessible if they are … Read more
What Is JavaScript Scope? Scope defines the context in which variables and functions are accessible. It specifies the area of your program where a variable or function can be referenced. By organizing code into different scopes, you can avoid naming conflicts and control variable accessibility effectively. Types of JavaScript Scope 1) Global Scope Variables declared … Read more
What Are JavaScript Errors? JavaScript errors are issues that prevent the code from executing as expected. These errors can be: Types of JavaScript Errors 1) Syntax ErrorSyntax errors occur when the code violates JavaScript’s syntax rules. These errors prevent the script from running. Example: console.log(“Hello World) // Missing closing quote// Uncaught SyntaxError: Unexpected string Solution:Always … Read more
In JavaScript, operator precedence determines the order in which operators are evaluated in an expression. When multiple operators appear in a single expression, the JavaScript engine uses precedence rules to decide which operator to execute first. What is Operator Precedence? Operator precedence defines the priority of operators in expressions. Operators with higher precedence are executed … Read more
What Are Regular Expressions? Regular expressions are patterns used to match character combinations in strings. In JavaScript, they are implemented using the RegExp object or regular expression literals. Syntax Regular Expression Literal: const regex = /pattern/flags; Using the RegExp Constructor: const regex = new RegExp(‘pattern’, ‘flags’); Flags in Regular Expressions Flags are optional modifiers that … Read more