each() for NodeLists

each.js

function each(nodelist, callback) {
  var i = -1,
      l = nodelist.length
  while (++i < l)
    callback.call(nodelist.item(i), i)
}

// Usage:
var divs = document.querySelectorAll("div")
each(divs, function(index) {
  this.textContent = "div index: " + index
})