Question

How to remove the last occurrence of comma from a string in JavaScript

Answer 1

String.prototype.replaceLastOccurrence = function(search, replace) {
	return this.replace(new RegExp(search + "([^" + search + "]*)$"), replace + "$1");
}

let str = 'c c++, javascript, python, php';

str = str.replaceLastOccurrence(",", "");

console.log(str);
 
   
   
   
   
/*
run:
   
"c c++, javascript, python php"
   
*/

  

  
 

 

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Answer 2

let str = 'c c++, javascript, python, php';

const lastIndex = str.lastIndexOf(',');

str = str.slice(0, lastIndex) + str.slice(lastIndex + 1);

console.log(str);
 
   
   
   
   
/*
run:
   
"c c++, javascript, python php"
   
*/

 

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