MODIFY AND DELETE ARRAY IN JAVASCRIPT
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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