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const previous = currentIndex => {
  const { items, setActiveId } = this.props
  const index = (currentIndex - 1 + items.length) % items.length
  setActiveId(items[index].id)
}

const next = currentIndex => {
  const { items, setActiveId } = this.props
  const index = (currentIndex + 1) % items.length
  setActiveId(items[index].id)

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stage all changedd files for a commit

git add .

stage specific file for a commit

git add /path/to/file

for some reason you want to unstage

git reset unstage all files
git reset /path/to/file unstage specific file

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function parseVideoURL(url) {

        function getParm(url, base) {
            var re = new RegExp("(\\?|&)" + base + "\\=([^&]*)(&|$)");
            var matches = url.match(re);
            if (matches) {
                return(matches[2]);
            } else {
                return("");
            }

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/**
 * Minimal CSS selector engine for modern browsers.
 * @param {String} selector A string containing a selector expression.
 * @param {Node=} opt_context The context to search within.
 * @returns {Node|NodeList} An element or list of matched elements.
 */

window.$$ = function(selector, opt_context) {
  var context = opt_context || document;
  var results = context.querySelectorAll(selector);

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var videoURL = 'http://www.youtube.com/watch?v=jkWWJ9W5300';
var videoID = videoURL.replace(/.*youtube.*watch.*v=([a-zA-Z0-9-_]+).*/,'$1');

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var root = location.protocol + '//' + location.host;

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if(window.addEventListener) { // correlates with media query support
	var timer = false
  ,	resize_monitor = function() {
  		if(timer) {
  			clearTimeout(timer);
  		}
  
  		timer = setTimeout(function() { _gaq.push(['_trackEvent', 'Resize', 'Resize', 'Resized']); }, 100);
        
        // or log a pageview on a non-existant page if you prefer

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function hideAddressBar() {

  	if( /iphone|ipod|android/gi.test( navigator.userAgent ) && !/crios/gi.test( navigator.userAgent ) ) {
			window.addEventListener( 'load', removeAddressBar, false );
			window.addEventListener( 'orientationchange', removeAddressBar, false );
		}

}

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function htmlEncode(value){
     return $('<div/>').text(value).html();
 }

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$.fn.serializeObject = function() {
      var o = {};
      var a = this.serializeArray();
      $.each(a, function() {
          if (o[this.name] !== undefined) {
              if (!o[this.name].push) {
                  o[this.name] = [o[this.name]];
              }
              o[this.name].push(this.value || '');
          } else {