May 7, 2011 · Replace object in an array, keeping the array order unchanged. I prefer the following way to update the new updated record into my array of records when I get data from the server. It keeps the order intact and quite straight forward one liner.

Here is how I'd like to do it: function update(array, newItem, atIndex) { return array.map((item, index) => index === atIndex ? newItem : item); } Generally, Array-spread operation produces few temporary arrays for you, but map doesn't, so it can be …

Mar 28, 2017 · Splice has a method to remove and add new elements. This script will do what you want: var fruits = ["Appple", "Banana", "Mango"]; fruits.splice(1, 1, 'Pear'); console.log(fruits); Here, you are saying that splice 1 items at index 1 and push "Pear" in that index.

Mar 13, 2025 · The splice() method of Array instances changes the contents of an array by removing or replacing existing elements and/or adding new elements in place. To create a new array with a segment removed and/or replaced without …

Apr 1, 2025 · The Array Indexing approach replaces an item in an array by directly accessing its position using the index and assigning a new value. This method is straightforward, modifies the original array, and is ideal for known index positions.

Aug 23, 2018 · Suppose you have an array like this: const items = ["B", "M", "X"]; And now you want to replace that second item ("J" instead of "M") and suppose that you already know its position as opposed to finding its position by doing an Array.prototype.find. Here's how you do it: const index = 1; const replacementItem = "J";

Jul 6, 2020 · In this article, we are going to learn what are the different ways to find and replace items inside of arrays. First, let's look at different ways of checking if our Array includes a certain value provided. We can do that in different ways such as:

Mar 22, 2023 · The splice () method allows you to add or remove elements from an array. You can use it to replace an element by specifying the index, the number of elements to remove (which is 1 in this case), and the new element to add.

Apr 15, 2022 · The indexOf () method returns the first index at which a given element can be found in an array. By using the indexOf (), we are finding the index of the name the user inputs (replaceInput) and replacing it with the (newInput), as long as the index value is not -1.

Nov 9, 2024 · When working with JavaScript arrays, the Array.Splice ) method provides a convenient way to replace items within the array. This method takes in parameters for the starting index , the number of elements to remove, and the new items to add.