In JavaScript, there are various modern and traditional approaches to manipulating strings. In this tutorial, we will show you how to remove the last 2, 3, 4, and N characters from a string in javascript by w3school.
How to Remove the Last 2,3,4, N Characters from a String in JavaScript
Using the following modern and traditional approach, you can remove the last 2,3,4, and N characters from a string in JavaScript by w3school:
- Approach 1: Using
slice()Method - Approach 2: Using
substring()Method - Approach 3: Using replace() with Regular Expression
Approach 1: Using slice() Method
The slice() method is a convenient way to remove a part of a string by specified start index to the end index with the given string.
To remove the last 2,3,4 and N characters, you can use negative indices:
// Original string
let givenStr = "Hello, World!";
// Remove the last 2 characters
let removedLast2 = givenStr.slice(0, -2);
// Remove the last 3 characters
let removedLast3 = givenStr.slice(0, -3);
// Remove the last 4 characters
let removedLast4 = givenStr.slice(0, -4);
// Remove the last N characters
let removedLast4 = givenStr.slice(0, -n);
console.log("Given String:", givenStr);
console.log("Removed Last 2:", givenStr);
console.log("Removed Last 3:", givenStr);
console.log("Removed Last 4:", givenStr);
Approach 2: Using substring() Method
The substring() method allows you to remove a part of a string based on specified start index to the end index with the given string.
To remove the last 2,3,4 and N characters, you can use this method along with the string’s length:
// Remove last 2 characters
let str1 = "example";
let result1 = str1.substring(0, str1.length - 2);
// Remove last 3 characters
let str2 = "hello";
let result2 = str2.substring(0, str2.length - 3);
// Remove last 4 characters
let str3 = "world";
let result3 = str3.substring(0, str3.length - 4);
Approach 3: Using replace() with Regular Expression
A regular expression and replace() method can also be to remove the last 2,3,4 and N characters from a string.
Here is an example of how to remove the last 2,3,4 N character from a string in JavaScript using regular expression:
// Original string
let originalString = "Hello, World!";
// Remove the last 2 characters
let removedLast2 = originalString.replace(/.{2}$/, '');
// Remove the last 3 characters
let removedLast3 = originalString.replace(/.{3}$/, '');
// Remove the last 4 characters
let removedLast4 = originalString.replace(/.{4}$/, '');
console.log("Original:", originalString);
console.log("Removed Last 2:", removedLast2);
console.log("Removed Last 3:", removedLast3);
console.log("Removed Last 4:", removedLast4);
Conclusion
In this tutorial, you have learned 3 approaches to removing the 2,3,4 and N last characters from a string in JavaScript. Choose the approach that fits your preference and coding style.
