To make an already existing array empty in JavaScript, you can use several methods to remove all elements from the array:

Setting Length to 0:

You can set the length property of the array to 0. This method truncates the array, effectively removing all its elements:

let arr = [1, 2, 3];
arr.length = 0; // Makes the 'arr' array empty

Using splice():

You can use the splice() method to remove all elements from the array starting from index 0:

let arr = [1, 2, 3];
arr.splice(0, arr.length); // Removes all elements from 'arr'

Using pop() in a Loop:

You can repeatedly use the pop() method in a loop to remove elements until the array becomes empty:

let arr = [1, 2, 3];
while (arr.length > 0) {

Assigning a New Empty Array:

You can assign a new empty array [] to the existing array variable. This reassigns the variable to reference a new empty array, effectively emptying the original array:

let arr = [1, 2, 3];
arr = []; // Assigns 'arr' to a new empty array, making the original array empty

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