JavaScript(JS) array method - length

The length property is not an array method, but a property of JavaScript arrays. It returns or sets the number of elements in an array.

Here's an example of how to use the length property:

let array = ['apple', 'banana', 'orange'];

console.log(array.length); // 3

array.length = 5;
console.log(array); // ['apple', 'banana', 'orange', undefined, undefined]

array.length = 2;
console.log(array); // ['apple', 'banana']

In this example, we have an array array containing the elements ['apple', 'banana', 'orange']. We use the length property to get the number of elements in the array, which is 3. We then set the length property to 5, which adds two undefined elements to the end of the array. Finally, we set the length property to 2, which removes the last element from the array.

Note that changing the length property of an array can have unintended consequences, such as adding or removing elements from the array. To add or remove elements from an array, it's generally better to use array methods such as push(), pop(), shift(), and unshift().