each

 each() 

Option name	Type	Description
list	Array, NodeList, HTMLCollection, Object
cb	Function

function each(list, cb) {

  if (!list) {
    return;
  }

  if (typeof cb !== 'function') {
    throw new Error('Cannot invoke `each` without a callback!');
  }

  var i = 0;
  var len = list.length;

  // Object
  if (len === undefined) {
    for (i in list) {
      if (i !== 'prototype' && list.hasOwnProperty(i)) {
        cb(i, list[i]);
      }
    }
  }
  // Array-like
  else {
    for (; i < len; i++) {
      cb(list[i]);
    }
  }
}

return each;
}));