Question

114

JavaScript equivalent of Python's format() function?

rated 0 times [ 121] [ 7] / answers: 1 / hits: 50267 / 14 Years ago, fri, february 11, 2011, 12:00:00

Python has this beautiful function to turn this:

bar1 = 'foobar'

bar2 = 'jumped'

bar3 = 'dog'



foo = 'The lazy ' + bar3 + ' ' + bar2 ' over the ' + bar1

# The lazy dog jumped over the foobar

Into this:

bar1 = 'foobar'

bar2 = 'jumped'

bar3 = 'dog'



foo = 'The lazy {} {} over the {}'.format(bar3, bar2, bar1)

# The lazy dog jumped over the foobar

Does JavaScript have such a function? If not, how would I create one which follows the same syntax as Python's implementation?

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katia

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2 Years ago

answered 14 Years ago alora · Accepted Answer

Another approach, using the String.prototype.replace method, with a replacer function as second argument:

String.prototype.format = function () {

  var i = 0, args = arguments;

  return this.replace(/{}/g, function () {

    return typeof args[i] != 'undefined' ? args[i++] : '';

  });

};



var bar1 = 'foobar',

    bar2 = 'jumped',

    bar3 = 'dog';



'The lazy {} {} over the {}'.format(bar3, bar2, bar1);

// The lazy dog jumped over the foobar