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To understand this example, you should have the knowledge of the following JavaScript programming topics:
Example 1: Empty Array by Substituting New Array
// program to empty an array
function emptyArray(arr) {
// substituting new array
arr = [];
return arr;
}
const array = [1, 2 ,3];
console.log(array);
// call the function
const result = emptyArray(array);
console.log(result);
Output
[1, 2, 3]
[]
In the above program, the value of array is substituted by a new empty array.
Example 2: Empty Array Using splice()
// program to append an object to an array
function emptyArray(arr) {
// substituting new array
arr.splice(0, arr.length);
return arr;
}
const array = [1, 2 ,3];
console.log(array);
// call the function
const result = emptyArray(array);
console.log(result);
Output
[1, 2, 3]
[]
In the above program, the splice() method is used to remove all the elements of an array.
In the splice() method,
- The first argument is the index of an array to start removing an item from.
- The second argument is the number of elements that you want to remove from the index element.
Example 3: Empty Array by Setting Length 0
// program to empty an array
function emptyArray(arr) {
// setting array length to 0
arr.length = 0;
return arr;
}
const array = [1, 2 ,3];
console.log(array);
// call the function
const result = emptyArray(array);
console.log(result);
Output
[1, 2, 3]
[]
In the above program, the length property is used to empty the array.
When setting array.length to 0, all the elements of the array are removed.
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