Compose and Pipe

composeAndPipe.js

var compose = function(){
  //Your code here
  var args = Array.prototype.slice.call(arguments);
  return function(val){
    return args.reduceRight(function(memo, fn){
      return fn(memo);
    }, val);
  };
};

var pipe = function(){
  //Your code here
  var args = Array.prototype.slice.call(arguments);
  return function(val){
    return args.reduce(function(memo, fn){
      return fn(memo);
    }, val);
  };
};

Quick reproduction of native compose and pipe in JS