module['exports'] = function(colors) {
// RoY G BiV
var rainbowColors = ['red', 'yellow', 'green', 'blue', 'magenta'];
return function(letter, i, exploded) {
if (letter === ' ') {
return letter;
} else {
return colors[rainbowColors[i++ % rainbowColors.length]](letter);
}
};
};