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Articles by AmitDiwan
Page 444 of 840
The debugger statement in JavaScript
The debugger statement in JavaScript is used to set a breakpoint in your code. When the JavaScript engine encounters this statement, it pauses execution and opens the browser's developer tools debugger (if available), allowing you to inspect variables, step through code, and debug issues. Syntax debugger; How It Works When the JavaScript engine hits a debugger statement: Execution pauses at that line Browser developer tools open automatically You can inspect the current scope, variables, and call stack If no debugger is available, the statement is ignored Example: Basic Debugging ...
Read MoreHow to calculate the average in JavaScript of the given properties in the array of objects
We have an array of objects. Each object contains a few properties and one of these properties is age: const people = [ { name: 'Anna', age: 22 }, { name: 'Tom', age: 34 }, { name: 'John', ...
Read MoreHow can we invoke the parent's method, when a child has a method with the same name in JavaScript?
When both parent and child classes have methods with the same name, JavaScript provides several ways to invoke the parent's method from the child class or externally. Syntax To call a parent method when overridden by a child class: // From within child class super.methodName() // From outside using call() ParentClassName.prototype.methodName.call(childObject) Using super Keyword (Recommended) The super keyword is the modern way to call parent methods from within a child class: class Parent { constructor(value) { this.value = ...
Read MoreBuilding a Map from 2 arrays of values and keys in JavaScript
In JavaScript, you can create a Map from two separate arrays containing keys and values. This is useful when you have parallel arrays where each index corresponds to a key-value pair. Problem Setup Suppose we have two arrays: const keys = [0, 4, 2, 3, 1]; const values = ["first", "second", "third", "fourth", "fifth"]; We need to create a Map where each key from the first array maps to the corresponding value from the second array at the same index. Using a for Loop The most straightforward approach is to iterate through ...
Read MoreJavaScript – Getting Coordinates of mouse
In JavaScript, you can get the coordinates of the mouse cursor using mouse event properties. The most common approach is to use the mousemove event listener along with event properties like clientX, clientY, pageX, and pageY. Mouse Coordinate Properties Different properties provide coordinates relative to different reference points: clientX, clientY - Coordinates relative to the viewport (visible browser window) pageX, pageY - Coordinates relative to the entire document (includes scrolled areas) screenX, screenY - Coordinates relative to the user's screen offsetX, offsetY - Coordinates ...
Read MoreObject de-structuring in JavaScript.
Object destructuring is a JavaScript feature that allows you to extract multiple properties from an object and assign them to variables in a single statement. It provides a clean and concise way to work with object properties. Syntax const { property1, property2, property3 } = object; Basic Example Object Destructuring Object Destructuring Example ...
Read MoreSorting JavaScript object by length of array properties.
In JavaScript, you can sort objects by the length of their array properties using the sort() method with a custom comparison function. This is useful when organizing data based on array sizes. Syntax array.sort((a, b) => a.property.length - b.property.length); Example: Sorting Students by Number of Subjects Sort by Array Length body { ...
Read MoreHow to get odd and even position characters from a string?
In JavaScript, you can extract characters from odd and even positions in a string using various methods. This technique is useful for string manipulation tasks like creating puzzles, encoding, or data processing. Understanding the Problem Given a string, we want to separate characters based on their position index: Even positions (0, 2, 4...): "T", "i", " ", "s", " ", "a", " ", "e", "t", "!" Odd positions (1, 3, 5...): "h", "s", "i", "", "i", "", "t", "s", "" If the string is "This is a test!" Even positions: "Ti s a ...
Read MoreGetting equal or greater than number from the list of numbers in JavaScript
We are required to write a JavaScript function that takes in an array of numbers as the first argument and a single number as the second argument. The function should return an array of all the elements from the input array that are greater than or equal to the number taken as the second argument. Example Following is the code − const arr = [56, 34, 2, 7, 76, 4, 45, 3, 3, 34, 23, 2, 56, 5]; const threshold = 40; const findGreater = (arr, num) => { const res = ...
Read MoreHow to multiply two Arrays in JavaScript?
In JavaScript, multiplying two arrays means performing element-wise multiplication, where each element at the same index in both arrays is multiplied together. This creates a new array with the products. Element-wise Array Multiplication When multiplying arrays, we iterate through corresponding indices and multiply the values at those positions: Array Multiplication Multiply Two Arrays Multiply Arrays ...
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