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JavaScript - get last n characters of string
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In this article, we would like to show you how to get the last n characters of a string in JavaScript.
Below we present two solutions on how to do that:
- Using
substring()method, - Using
slice()method.
The below example shows how to use .substring() method to get the last n characters of the text string.
Runnable example:
xxxxxxxxxx1
var text = '12345';2
3
var n = 3;4
var substring = text.substring(text.length - n);5
6
console.log(substring); // 345Another practical example:
xxxxxxxxxx1
var n = 3;2
3
console.log( "".substring("".length - n) === "" ); // true means string is empty4
console.log( "1".substring("1".length - n) ); // 15
console.log( "12".substring("12".length - n) ); // 126
console.log( "123".substring("123".length - n) ); // 1237
console.log( "1234".substring("1234".length - n) ); // 2348
console.log( "12345".substring("12345".length - n) ); // 345The below example shows the use of .slice() method with negative index to get the last n characters of the text string.
Runnable example:
xxxxxxxxxx1
var text = '12345';2
3
var n = 3;4
var substring = text.slice(-n);5
6
console.log(substring); // 345In the second example, we can see that we can also use string slice() with negative indexes on a shorter or empty string which will give us the following results:
xxxxxxxxxx1
var n = 3;2
3
console.log( "".slice(-n) === "" ); // true means string is empty4
console.log( "1".slice(-n) ); // 15
console.log( "12".slice(-n) ); // 126
console.log( "123".slice(-n) ); // 1237
console.log( "1234".slice(-n) ); // 2348
console.log( "12345".slice(-n) ); // 345