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JavaScript

Function.prototype.bind = function (oThis) {  
if (typeof this !== "function") {  
  // closest thing possible to the ECMAScript 5 internal IsCallable function  
  throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");  
}  

var aArgs = Array.prototype.slice.call(arguments, 1),   
    fToBind = this,   
    fNOP = function () {},  
    fBound = function () {  
      return fToBind.apply(this instanceof fNOP  
                             ? this  
                             : oThis || window,  
                           aArgs.concat(Array.prototype.slice.call(arguments)));  
    };  

fNOP.prototype = this.prototype;  
fBound.prototype = new fNOP();  

return fBound;  
};  




    var DateJan2042 = Date.bind(null, 2042, 0);

    /*1*/ console.assert(Function.prototype.bind.length == 1, 'bind should have a length of 1');
    /*2*/ console.assert(typeof DateJan2042 == 'function', 'bind() should return a function');
    /*3*/ console.assert(!DateJan2042.hasOwnProperty('prototype'), 'Bound function must not have a prototype');
    /*4*/ console.assert(DateJan2042.length == Math.max(Date.length - 2, 0), 'Bound function should have a proper length');
    /*5*/ console.assert(typeof DateJan2042() == 'string', 'Function call should return a string');
    /*6*/ console.assert({}.toString.call(new DateJan2042()).indexOf('Date') != -1, 'Constructor call should return a new Date object');
    /*7*/ console.assert(new DateJan2042() instanceof DateJan2042, 'Instanceof check should pass for constructor\'s return value');
    /*8*/ console.assert((new DateJan2042()).getMonth() == 0, 'Constructor should be called with bound arguments');
    /*9*/ console.assert((new DateJan2042(1)).getDate() == 1, 'Constructor should take additional arguments');
    /*10*/ console.assert(!/^function *\( *[^ )]/.test(Function.prototype.toString.call(DateJan2042)), 'Bound function should have no formal arguments');