Function.prototype.currying.js

(function() {
  if (!Function.prototype.callFn) {
    Function.prototype.callFn = function(scope/*, args */) {
      var args = Array.prototype.slice.call(arguments, 1);
      return this.applyFn(scope, args);
    };
  }
  
  if (!Function.prototype.applyFn) {
    Function.prototype.applyFn = function(scope, args) {
      var fn = this;
      return function closurized() {
        return fn.apply(scope, args);
      }
    };
  }
  
  if (!Function.prototype.lcurry) {
    Function.prototype.lcurry = function(scope/*, args */) {
      var args = Array.prototype.slice.call(arguments, 1);
      return this.lcurryApply(scope, args);
    };
  }
  
  if (!Function.prototype.rcurry) {
    Function.prototype.rcurry = function(scope/*, args */) {
      var args = Array.prototype.slice.call(arguments, 1);
      return this.rcurryApply(scope, args);
    };
  }
  
  if (!Function.prototype.lcurryApply) {
    Function.prototype.lcurryApply = function(scope, args) {
      var fn = this;
      return function() {
        var newArgs = Array.prototype.slice.call(arguments, 0);
        return fn.apply(scope, args.concat(newArgs));
      }
    };
  }
  
  if (!Function.prototype.rcurryApply) {
    Function.prototype.rcurryApply = function(scope, args) {
      var fn = this;
      return function() {
        var newArgs = Array.prototype.slice.call(arguments, 0);
        return fn.apply(scope, newArgs.concat(args));
      }
    };
  }
})();

(function() {
  function logStr(str) {
    console.log(str);
  }
  
  function log2Str(str1, str2) {
    console.log(str1, str2);
  }
  
  var callLogStr = logStr.callFn(null, "a");
  var applyLogStr = logStr.applyFn(null, ["b"]);
  var lcurryLog2Str = log2Str.lcurry(null, "a");
  var rcurryLog2Str = log2Str.rcurry(null, "a");
  
  callLogStr();
  applyLogStr();
  lcurryLog2Str("b");
  rcurryLog2Str("b");
  
  Function.prototype.callFn = undefined;
  Function.prototype.applyFn = undefined;
  Function.prototype.lcurry = undefined;
  Function.prototype.lrcurry = undefined;
  Function.prototype.lcurryApply = undefined;
  Function.prototype.lrcurryApply = undefined;
})();