add to array in javascript

To add an element to an array in JavaScript, there are multiple ways to accomplish this task.

1. Using push() method: The push() method adds one or more elements to the end of an array and returns the new length of the array.

index.tsx
let arr = [1, 2, 3];
arr.push(4);
console.log(arr); // Output: [1, 2, 3, 4]
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2. Using spread operator: The spread operator(...) can also be used to add an element(s) to an array.

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

3. Using concat() method: The concat() method is used to merge two or more arrays into one, but it can also be used to add an element(s) to an array.

index.tsx
let arr = [1, 2, 3];
arr = arr.concat(4);
console.log(arr); // Output: [1, 2, 3, 4]
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4 lines