jsFormatter.js

var re = /\{\d\}/
var str = 'My name is {0} . My location is {1}. My country is {2}'


function formatter (str) {
	var params = Array.prototype.splice.call(arguments, 1)
	for(var i=0;i<params.length;i++){
  	str = str.replace(re, params[i])
  }
  return str
}

console.log(formatter(str, 'abhinav', 'sharma', 'india'))