The Array.splice() method is a built-in JavaScript function used to add, remove, or replace elements in an array. It modifies the original array directly and is commonly used for tasks requiring precise control over array elements. Syntax Parameters Parameter Description start (Required) The index at which to start changing the array. Negative values count from…
The Array.some() method is a built-in JavaScript function that tests whether at least one element in an array passes a provided test implemented by a callback function. It stops execution and returns true when it finds an element that satisfies the condition, making it efficient for use cases where partial matches are sufficient. Syntax Parameters…
The Array.slice() method is a built-in JavaScript function that creates a shallow copy of a portion of an array into a new array. The selected portion is determined by the start and end indices. It does not modify the original array and is commonly used for extracting parts of an array or creating duplicates. Syntax…
The Array.shift() method is a built-in JavaScript function used to remove the first element from an array and return it. This method modifies the original array, reducing its length by one. Syntax Parameters The shift() method does not take any parameters. Return Value The shift() method returns: Example 1: Removing the First Element Example 2:…
There are multiple approaches to finding the sum of an array of numbers in JavaScript. 1. Using for Loop The for loop is a basic and widely used approach to sum the elements of an array. Initialize a variable to store the sum and iterate through the array, adding each element to the sum. 2….
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Flattening an array means converting a multi-dimensional array (an array containing nested arrays) into a single-dimensional array. There are different ways to Merge or flatten an array of arrays into a single array. Examples 1. Using Array flat() Method (ES2019) The flat() method is a built-in function introduced in ES2019 (ES10) that flattens an array…
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Given an array, the task is to replace an item in a JavaScript array. There are multiple ways to replace an item in an array in JavaScript. 1. Using Array splice() Method The splice() method is used to remove, replace, or insert elements into an array at a specified index. 2. Using Array map() Method…
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Given an Array with elements, the task is to copy the array by value in JavaScript. There are different ways to copy arrays by value in JavaScript. Understanding Reference vs Value JavaScript arrays are objects. When assigning an array to another variable, you copy the reference, not the actual array. Modifying one will affect the…
Given an array, the task is to get the last item of an array in JavaScript. There are several ways to get the last item of an array. 1. Using Bracket Notation Arrays in JavaScript are zero-indexed, meaning the first item is at index 0. You can use the length of the array to calculate…
In JavaScript, arrays are a special type of object, which means using basic methods like typeof doesn’t give accurate results for distinguishing arrays from other objects. To correctly identify whether a variable is an array, JavaScript provides several approaches, each suited for different use cases. This article will walk you through all the reliable methods…
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