classwork19-3-2012.js

var apply = function(array){
	var fun = array[0];
	var arg = array[1];

	return fun(arg);
}

var aa = function(fun){
	return function(array){
		var ret;
		ret = array.map(fun);
		return ret;
	}
}

var comp2 = function(funArray){
	return function(arg){
		var f = funArray[0];
		var g = funArray[1];
		return f(g(arg));
	}
}

var compn = function(funArray){
	return function(args){
		var fun = funArray.reduce(function(prev,curr){
			return function(x){
				return prev(curr(x))}})
		return fun(args);
	}
}

var compnVar = function(funArray){
	return function(args){
		var fun = funArray.reduce(function(prev,curr){return comp2([prev,curr])})
			
		return fun(args);
	}
}
 
var cons = function(funArray){
	return function(arg){
		var ret = [];
		for (var i = 0; i < funArray.length; i++){
			ret.push(funArray[i](arg))	}
		return ret;
	}
}

var distributeLeft = function(array){
	return function(x){
		return array.map(function(item){return [x,item]})
}
}

var trans = function(array){
	var ret;
	for (var i = 0; i < array.length; i++){
		for (var j = 0; j < array[i].length; j++){

			(ret[j] = ret[j] || [])[i] = array[i][j];
		}
	}
	return ret;
}