.length

The .length property is used on arrays and strings to quickly find out how many items are in an array or how many characters are in a string. This property is straightforward to use and plays a crucial role in JavaScript, making it simple for developers to work with the data.

Syntax

myString.length

Note: The .length property is not a method but a property. It cannot be invoked with parentheses, like .length(). Instead, it can only be referenced as .length.

Example

The .length property is applied to an array and a string, respectively, to quickly determine their sizes (number of elements for an array and number of characters for a string). This property provides a convenient and efficient way to work with data in JavaScript.

const fruits = ['apple', 'banana', 'orange', 'grape'];
const numberOfFruits = fruits.length;
console.log(numberOfFruits);

const message = 'Hello, world!';
const messageLength = message.length;
console.log(messageLength);

This example results in the following output:

4
13