Is there a C# String.Format() equivalent in JavaScript? [duplicate]

Question

C# has the really powerful String.Format() for replacing elements like {0}with parameters. Does JavaScript have an equivalent?

Answer 1

Try sprintf() for javascript.

Or

// First, checks if it isn't implemented yet. if (!String.prototype.format) {   String.prototype.format = function() {     var args = arguments;     return this.replace(/{(\d+)}/g, function(match, number) {        return typeof args[number] != 'undefined'         ? args[number]         : match       ;     });   }; }  "{0} is dead, but {1} is alive! {0} {2}".format("ASP", "ASP.NET") 

Both answers pulled from JavaScript equivalent to printf/string.format

Answer 2

I am using:

String.prototype.format = function() {     var s = this,         i = arguments.length;      while (i--) {         s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);     }     return s; }; 

usage: "Hello {0}".format("World");

I found it at Equivalent of String.format in JQuery

UPDATED:

In ES6/ES2015 you can use string templating for instance

'use strict';  let firstName = 'John',     lastName = 'Smith';  console.log(`Full Name is ${firstName} ${lastName}`);  // or console.log(`Full Name is ${firstName + ' ' + lastName}');