String formatting in JavaScript

Sunasara Imdadhusen, 20 May 2014

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String.Format creates strings from a pattern and values.

Download format_string.zip - 1.2 KB

Introduction

Replaces each format items in a specified string with the text equivalent of a corresponding parameters value. One or more format items in a specified string with the string representation of a specified parameter value.

Syntax

'string with format{0}'.format(Object arg0, Object arg1, Object argn);

Parameters

{0} : type of string object

arg0 : The first object to format.

arg1 : The second object to format.

argn : The N^th object to format.

Using the code

String.prototype.format = function () {
    var args = arguments;
    return this.replace(/\{\{|\}\}|\{(\d+)\}/g, function (m, n) {
        if (m == "{{") { return "{"; }
        if (m == "}}") { return "}"; }
        return args[n];
    });
};

Example

This example shows the use of the string.Format method to combine three strings with formatting options. The format string itself is the first argument to the string.Format method and it is specified as a string literal.

The "{0}", "{1}", "{2}" and "{N}" indicate where the first, second, third and N^th arguments are inserted in to the string object. The parameter should be between the { } brackets.

"Hello {0}.{1}, Welcome to our new house at {2}.".format('Mr','Imdadhusen','Ahmedabad');

Output:

Hello Mr.Imdadhusen, Welcome to our new house at Ahmedabad.

More Examples

Input

var startDate = "21 APR 2014";
var endDate = "24 APR 2014";
"Your score is {0} out of {1}".format(175,250);
"Dear {0}, Your ticket is booked for {1} days from {2} to {3}. Thank you for booking from {4}".format('Imdadhusen',4,startDate, endDate, 'www.happybooking.com');
"World T{0} - {1}th match, Group {2}, {3} v {4}, {3} won by {5} wickets (with {6} balls remaining).  {4}'s next match will be on {7}.".format(20,13,2,'India','Pakistan', 7, 9, '25 Apr 2014');

Ouput

Your score is 175 out of 250 

Dear Imdadhusen, Your ticket is booked for 4 days from 21 APR 2014 to 24 APR 2014. Thank you for booking from www.happybooking.com

World T20 - 13th match, Group 2, India v Pakistan, India won by 7 wickets (with 9 balls remaining). Pakistan's next match will be on 25 Apr 2014.