Functional Javascript

bind.js

bind = function(oThis) {
  if (typeof this !== "function") {
    throw new TypeError("Function.prototype.bind is not callable");
  }
  var aArgs = Array.prototype.slice.call(arguments, 1),
    fToBind = this,
    fNOP = function() {},
    fBound = function() {
      return fToBind.apply(this instanceof fNOP && oThis
        ? this
        : oThis,
        aArgs.concat(Array.prototype.slice.call(arguments)));
    };
  fNOP.prototype = this.prototype;
  fBound.prototype = new fNOP();

  return fBound;
};

curry-bind.js

// currying
function curry1(fun) {
  return function(arg) {
    return fun(arg);
  }
}

function curry2(fun) {
  return function(arg2) {
    return function(arg1) {
      return fun(arg1, arg2);
    }
  }
}

// partially applying
function partial1(fun, arg1) {
  var args = construct(arg1, arguments);
  return fun.apply(fun, args);
}
function partial2(fun, arg1, arg2) {
  var args = concat([arg1, arg2], arguments);
  return fun.apply(fun, args);
}
function partialn(fun, ...) {
  var pargs = _.rest(arguments);
  return function() {
    var args = concat(pargs, _.toArray(arguments))；
    return fun.apply(fun, args);
  }
}