.length

The .length array property returns the specific number of elements in the array.

Syntax

array.length;

Setting the length with a positive value that is lower than the actual array length will delete items at end.

Examples

const daysOfWeek = [
  'Monday',
  'Tuesday',
  'Wednesday',
  'Thursday',
  'Friday',
  'Saturday',
  'Sunday',
];

const lengthOfWeek = daysOfWeek.length;

console.log(lengthOfWeek);
// Output: 7

Iterating over an array using length:

const numbers = [10, 20, 30, 40, 50];

const length = numbers.length;

for (let i = 0; i < length; i++) {
  numbers[i] *= 2;
}

console.log(numbers);
// Output: [20, 40, 60, 80, 100]

Shortening an array:

const colors = ['purple', 'orange', 'yellow', 'green', 'blue'];

console.log(colors.length);
// Output: 5

colors.length = 3;

console.log(colors);
// Output: ['purple', 'orange', 'yellow']