The length property returns the number of characters in a string.
Example
// defining a string
let sentence = "I love Programiz.";
// returns number of characters in the sentence string
let len = sentence.length;
console.log(len);
// Output:
// 17
length Syntax
The syntax of the length property is:
str.length
Here, str is a string.
length Parameters
The length property does not take any parameters.
length Return Value
- Returns the number of characters in a string.
Note: The String.length property returns the code units in the UTF-16 string format. Some rare string characters require two code units to be represented. Due to this, the length property might not always return the number of characters.
Example 1: Using length Property
// defining string
let string1 = "JavaScript";
// returns the number of characters in 'JavaScript'
let len = string1.length;
console.log(len);
Output
10
In the above example, we have defined a string named string1. We have then used the length property to find out the number of characters in string1.
Since 'JavaScript' contains 10 characters, string1.length returns 10.
Example 2: length Property is Read Only
The String.length property is a read-only property. There will be no effect if we try to change it manually. For example:
let string2 = "Programming";
// assigning a value to string's length property
string2.length = 5;
// doesn't change the original string
console.log(string2); // Programming
// returns the length of 'Programming'
console.log(string2.length); // 11
Output
Programming 11
Here we have assigned a new value to string2.length. Since the String.length property is read-only, assigning value to it doesn't change the original array.
string2.length returns 11 which is the length of 'Programming'.
Also Read: