gistfile1.txt

var Step = require('step');
function someFunc(i, callback){
  function cbWrapper(){ callback(undefined, i); }
  i % 2 == 0 ? cbWrapper() : setTimeout(cbWrapper, 10);
}

Step(
  function process(){
    var group = this.group();
    for(var i = 0; i < 10; i++){
        someFunc(i, group() );
    }
  },
  function end(err, data){
    console.log(err || data);
  }
);