Javascript String length property

Introduction

Each instance of String contains a single property, length. 

string.length

It indicates the number of characters in the string. 


let stringValue = "hello world"; 
console.log(stringValue.length);   // "11"

This example outputs "11", the number of characters in "hello world". 

let x = 'CSS';
let empty = '';

console.log(x + ' is ' + x.length + ' code units long');
console.log('The empty string has a length of ' + empty.length);

For a double-byte character, each character is still counted as one.

JavaScript strings consist of 16 bit code units.

For most characters, each 16 bit code unit will correspond to a single character.

The length property indicates how many 16 bit code units occur inside the string: 

let message = "abcde"; 
console.log(message.length);  // 5



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