Ruby Titleize for Javascript.

ruby_titleize_for_javascript.js

String.prototype.titleize = function() {
    var words = this.replace(/_/g, ' ').split(' ')
    var array = []
    for (var i = 0; i < words.length; ++i) {
        array.push(words[i].charAt(0).toUpperCase() + words[i].toLowerCase().slice(1))
    }
    return array.join(' ');
}