for each loop helper from hammer.js

foreach.js

var Obj = {

each: function(obj, iterator, context) {
    var i, o;
    // native forEach on arrays
    if ('forEach' in obj) {
      obj.forEach(iterator, context);
    }
    // arrays
    else if(obj.length !== undefined) {
      for(i=-1; (o=obj[++i]);) {
        if (iterator.call(context, o, i, obj) === false) {
          return;
        }
      }
    }
    // objects
    else {
      for(i in obj) {
        if(obj.hasOwnProperty(i) &&
            iterator.call(context, obj[i], i, obj) === false) {
          return;
        }
      }
    }
  }
  
}