MODIFY AND DELETE ARRAY IN JAVASCRIPT

Published: 08 November 2024
on channel: SmituCodes

To modify or delete elements in an array, there are a few common methods in JavaScript. Here are some examples:

1. Modifying an Array

Updating an Element: You can change a specific element by referencing its index.

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let arr = [1, 2, 3, 4]; arr[1] = 10; // Changes the second element to 10 console.log(arr); // Output: [1, 10, 3, 4]

Using splice(): This can add or replace elements at a specific index.

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let arr = [1, 2, 3, 4]; arr.splice(1, 1, 20); // Replaces the second element with 20 console.log(arr); // Output: [1, 20, 3, 4]

2. Deleting Elements from an Array

Using splice(): It removes elements from a specific index.

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let arr = [1, 2, 3, 4]; arr.splice(1, 2); // Removes 2 elements starting from index 1 console.log(arr); // Output: [1, 4]

Using pop(): Removes the last element.

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let arr = [1, 2, 3, 4]; arr.pop(); console.log(arr); // Output: [1, 2, 3]

Using shift(): Removes the first element.

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let arr = [1, 2, 3, 4]; arr.shift(); console.log(arr); // Output: [2, 3, 4]

Using delete: Sets an element to undefined without changing the array length.

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let arr = [1, 2, 3, 4]; delete arr[1]; // Sets the second element to undefined console.log(arr); // Output: [1, undefined, 3, 4]

Each of these methods provides a different way to modify or delete elements in an array based on your needs...#learnhtml5andcss3#codingchallenge #code #webdevelopment #codewithme #WebDevelopment

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