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// soft bind this
'use strict';

if (!Function.prototype.softBind) {
  Function.prototype.softBind = function (obj) {
    var fn = this;
    var curried = [].slice.call(arguments, 1);
    var bound = function bound() {
      return fn.apply(!this || this === (window || global) ? obj : this, curried.concat(arguments));
    };
    bound.prototype = Object.create(fn.prototype);
    return bound;
  };
}

// example
function foo() {
  console.log('name: ' + this.name);
}

var obj_1 = { name: 'obj_1' },
    obj_2 = { name: 'obj_2' },
    obj_3 = { name: 'obj_3' };

var foo_binded = foo.softBind(obj_1);
foo_binded(); // 'obj_1'

obj_2.foo = foo.softBind(obj_1);
obj_2.foo(); // 'obj_2'

foo_binded.call(obj_3); // 'obj_3'

setTimeout(obj_2.foo, 10); // 'obj_1'