Run scripts sequentially using pipe()

gistfile1.js

  var files = [
    'first.js',
    'second.js',
    'third.js',
    'fourth.js'
  ];

  var scriptsLoaded;

  while( files.length ) {
    (function() {
      var currentUrl = files.shift();
      if (typeof scriptsLoaded === 'undefined') {
        scriptsLoaded = $.getScript( currentUrl );
      }
      else {
        scriptsLoaded.pipe(function() { return $.getScript( currentUrl ); })        
      }
    }());
  }

  $.when( scriptsLoaded ).done(function() {
      // All scripts are now loaded assuming none of them failed
  });