ifElse function

ifElse.js

function ifElse(pred,true_fn,else_fn,xs) {
  for (var i = 0; i < xs.length; i++) {
	  if (pred(xs[i]) === true) {
      // return matched item, index, array to yes_func
      return true_fn(xs[i],i,xs) }}
  // return array to no_func
  return else_fn(xs) }

// what does this do?

function returnSliceOnMatch(match,xs) {
    return ifElse( 
           function(x) { return x == match }
		  ,function(matched_item,item_index,xs) { return xs.slice(item_index) }
		  ,function() { return [] } // ignore values passed to function and return empty list
		  ,xs) }

returnSliceOnMatch(5,[1,2,3,4,5,6,7,8,9]) === [5,6,7,8,9]
returnSliceOnMatch(5,[1,2,3,4,6,7,8,9]) === []

function say_hello_if_true(xs) {
	return ifElse(
	         function(x) { return x === true }
			,function() {alert("hello")}
			,function() {}
			,xs) }