Remove last N characters from string in javascript

Many times we come across a requirement to remove the last N characters from a string in javascript. This article will discuss removing a few characters from the string based on the value we pass for N using different examples illustrations.

Table of Contents:-

• Javascript remove last N characters from a string using substring()
• Javascript remove last N characters from a string using slice()

Javascript remove last N characters from a string using substring()

Javascript’s substring(startIndex, endIndex) method returns a substring from the original string based on the start and end indexes passed as parameters.

• The startIndex is the first argument that specifies from where the substring should begin. The character at the startIndex is included in the substring.
• The endIndex is the second argument to the method and is optional. The endIndex specifies till which character the substring will be formed, excluding the character at the endIndex.

Syntax:-

<original_string>.substring(0, <original_string>.length - N)

Example1:-

Remove the last 8 characters from the string “Javascript is popular language”

Code:-

let dummyString = "Javascript is popular language"
let finalString = dummyString.substring(0, dummyString.length - 8)
console.log("original string: " + dummyString)
console.log("final string: " + finalString)

Explanation:-

The above code uses the substring() method to retrieve a portion of the string from the original, starting from the index position 0 till ->  length of the string-8. The value of N, in this case, is 8.

Output:-

original string: Javascript is popular language
final string: Javascript is popular 

Example2:-

Remove the last 3 characters from the string “Javascript123”

Code:-

let dummyString = "Javascript123"
let finalString = dummyString.substring(0, dummyString.length - 3)
console.log("original string: " + dummyString)
console.log("final string: " + finalString)

The value of N, in this case, is 3.

Output:-

original string: Javascript123
final string: Javascript

Javascript remove last N characters from a string using slice()

Javascript’s slice(startIndex, endIndex) method returns a new String object part of the original string. The slice method will not modify the original string. 

• The startIndex is the first argument that specifies from where the extraction should begin. The index is zero-based, and if the value is negative, it means -> length of the original string + startIndex
• The endIndex is the second argument to the method and is optional. The extraction will end before the endIndex. 

Syntax:-

<original_string>.slice(0, -N)

Example1:-

Remove the last 8 characters from the string “Javascript is popular language”

Code:-

let dummyString = "Javascript is popular language"
let finalString = dummyString.slice(0,-8)
console.log("original string: " + dummyString)
console.log("final string: " + finalString)

Explanation:-

The above code is using the slice() method to retrieve a portion from the original starting, which starts from the character at 0^th index till the index -> (dummyString + (-8)).

Output:-

original string: Javascript is popular language
final string: Javascript is popular 

Example2:-

Remove the last 3 characters from the string “Javascript123”

Code:-

let dummyString = "Javascript123"
let finalString = dummyString.slice(0, -3)
console.log("original string: " + dummyString)
console.log("final string: " + finalString)

The value of N, in this case, is 3.

Output:-

original string: Javascript123
final string: Javascript

Read More:

• Javascript remove line breaks from string (4 ways)
• Remove special characters from a string in python
• Javascript: How to remove text from string
• Javascript: Remove last character of string
• Javascript: Remove first character from a string

We hope this article helped you to delete the last N characters from a string in javascript. Good Luck !!!