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…
There are several methods to check if a variable is an array or not. In this article, we will explore all methods with code examples and explanations. 1. Using Array.isArray() Method The basic method to check if a variable is an array or not is by using the Array.isArray() method. It is a built-in JavaScript…
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No, we cannot directly use break in forEach. However, there are workarounds and alternative solutions that allow you to achieve similar functionality. 1. Why Can’t You Use break in forEach? The forEach method is designed to iterate over each element of an array without providing a direct way to terminate the loop. Unlike traditional for…
There are various methods to empty an array in JavaScript. 1. Setting the Length Property to 0 The length property of an array defines the number of elements in the array. Setting it to 0 effectively clears all elements. 2. Reassigning to an Empty Array You can replace the existing array with a new empty…
There are multiple ways to add new elements at the beginning of an array in JavaScript. 1. Using unshift() Method The unshift() method add elements to the beginning of an array. It modifies the original array and returns the new length of the array. Adding One Element Adding Multiple Elements 2. Using splice() Method The…
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There are different approaches to accessing the first and last elements of an array in JavaScript. 1. Using Array Indexing The basic method to access the first and last elements of an array is through indexing. 2. Using shift() and pop() Methods JavaScript provides shift() to remove and return the first element and pop() to…
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The length of an array in JavaScript refers to the number of elements it contains. Knowing how to find the array length is a fundamental skill, as it is essential for loops, conditions, and many array operations. JavaScript provides multiple ways to determine an array’s length, either directly or indirectly. 1. Using length Property The…
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