javascript tripple closure.js

var gameTrigger = [
  {
    when:        2
    ,delayMin:    4 /* time between creep spawns */
    ,delayMax:    5
    ,multiplier:  1 
    ,creeps: [
       { count: 5,      type: Soot }
      ,{ count: 5,      type: SootLevel2 }
      ,{ count: 4,      type: Soot }
      ,{ count: 1,      type: SootLevel2 }  // can be boss as well 
      
      ,{ count: 4,      type: Soot }
      ,{ count: 3,      type: SootLevel2 }
      ,{ count: 4,      type: Soot }
      ,{ count: 3,      type: Soot }
      ,{ count: 3,      type: SootLevel2 }
      ,{ count: 2,      type: Soot }
    ]
  }

/* tripple closure! */

function() { 
    // ....

    window.currentWave = 0;
    var wave = window.gameTrigger[ window.currentWave ];
    setTimeout( function() { 
      var currentTimeout = 0;
      for( i = 0; i < wave.creeps.length; i++ )
      {
        currentTimeout += Math.random() * ( wave.delayMax - wave.delayMin )  + wave.delayMin;

        /* trigger sub-waves */
        setTimeout( function(a) { 
          /* have to return a new function using the argument so that 
             the for loop "i" index is evaluated correctly in the nested
             setTimeout.  Sweet!
           */
          return function() {
            for( j = 0; j < wave.creeps[ a ].count; j++ )
            {
              /* pause a bit between each creeps */
              setTimeout( function() { 
                self.addCreep( 0, 0, wave.creeps[ a ].type );
              }, ( Math.random() * 5 + 4 ) * 1000);
            }
          };
        }( i ), currentTimeout * 1000 );
      }
      
    }, wave.when * 1000 );
}