Compose example

gistfile1.txt

var consoleLine = "<p class=\"console-line\"></p>";

console = {
    log: function (text) {
        $("#console-log").append($(consoleLine).html(text));
    }
};

// New function called compose
// works from right to left
var compose = function(f, g) {
  return function(x) {
    return f(g(x));
  };
};

function curry(func) {
  var requiredArgs = func.length; 
  return function curried() {
    var args = Array.prototype.slice.call(arguments, 0);
    if (args.length >= requiredArgs) {
      return func.apply(null, args);
    }
    return function() {
      var args2 = Array.prototype.slice.call(arguments, 0);
      return curried.apply(null, args.concat(args2)); 
    };
  };
}

var multiply = curry(function(x,y) {
	return x * y;
});

var append = curry(function(x,y) {
	return y+x;
});

const multiplyBy100 = multiply(100);
const formatAsPercent = append('%');

const commision = 0.05;
const commisionAsPercentage = compose(formatAsPercent, multiplyBy100);
console.log(commisionAsPercentage(commision));