How to Remove the Last Character from a String in JavaScript
To remove the last character from a string in JavaScript, you should use the slice() method.
It takes two arguments: the start index and the end index.
slice() supports negative indexing, which means that slice(0, -1) is equivalent to slice(0, str.length - 1).
let str = 'Masteringjs.ioF';
str.slice(0, -1); // Masteringjs.ioAlternative Methods
slice() is generally easier, however other methods available are substring() and replace().
substring() does not have negative indexing, so be sure to use str.length - 1 when removing the last character from the string.
replace() takes either a string or a regular expression as its pattern argument.
Using /.$/ as the regular expression argument matches the last character of the string, so .replace(/.$/, '') replaces the last character of the string with an empty string.
let str = 'Masteringjs.ioF';
str.substring(0, str.length - 1); // Masteringjs.io
str.substr(0, str.length - 1); // Masteringjs.io
str.replace(/.$/, ''); // Masteringjs.ioAdvanced Features
With replace(), you can specify if the last character should be removed depending on what it is with a regular expression.
For example, suppose you want to remove the last character only if the last character is a number.
You can use .replace(/\d$/, '') as shown below.
// For a number, use \d$.
let str = 'Masteringjs.io0';
str.replace(/\d$/, ''); // Masteringjs.io
let str2 = 'Masteringjs.io0F';
// If the last character is not a number, it will not replace.
str.replace(/\d$/, ''); // Masteringjs.io0F;