JavaScript equivalent to printf/String.Format

Question

I\'m looking for a good JavaScript equivalent of the C/PHP printf() or for C#/Java programmers, String.Format() (IFormatProvider for .

Answer 1

I'm surprised no one used reduce, this is a native concise and powerful JavaScript function.

ES6 (EcmaScript2015)

String.prototype.format = function() {
  return [...arguments].reduce((p,c) => p.replace(/%s/,c), this);
};

console.log('Is that a %s or a %s?... No, it\'s %s!'.format('plane', 'bird', 'SOman'));

< ES6

function interpolate(theString, argumentArray) {
    var regex = /%s/;
    var _r=function(p,c){return p.replace(regex,c);}
    return argumentArray.reduce(_r, theString);
}

interpolate("%s, %s and %s", ["Me", "myself", "I"]); // "Me, myself and I"

How it works:

reduce applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

var _r= function(p,c){return p.replace(/%s/,c)};

console.log(
  ["a", "b", "c"].reduce(_r, "[%s], [%s] and [%s]") + '\n',
  [1, 2, 3].reduce(_r, "%s+%s=%s") + '\n',
  ["cool", 1337, "stuff"].reduce(_r, "%s %s %s")
);