向String.Prototype添加函数

Question

While reading Secrets of the JavaScript Ninja , I encountered this code on partial function application:

String.prototype.csv = String.prototype.split.partial(/,\s*/);

var results = ("Mugan, Jin, Fuu").csv();

console.log("results:", results);

But, when I tried to run it in jsfiddle( http://jsfiddle.net/Y2Tv4/ ), I got this error:

Uncaught TypeError: Object function split() { [native code] } has no method 'partial'

How can I add the csv function to the String.Prototype ?

Answer 1

below is the code to execute this method and referece taken from @elclanrs given url good one bro. Check out this FIDDLE http://jsfiddle.net/Y2Tv4/1/

    Function.prototype.partial = function(){
    var fn = this, args = Array.prototype.slice.call(arguments);
    return function(){
      var arg = 0;
      for ( var i = 0; i < args.length && arg < arguments.length; i++ )
        if ( args[i] === undefined )
          args[i] = arguments[arg++];
      return fn.apply(this, args);
    };
  };

String.prototype.csv = String.prototype.split.partial(/,\s*/);

     var results = ("Mugan, Jin, Fuu").csv();
 console.log(results);