title: JQuery and Underscore "each" guarantee order for an array?
body: <p>I read on Javascript: The Good Parts...</p>
  
  <blockquote>
    <p>Since JavaScript’s arrays are really objects, the <code>for in</code> statement can be used to iterate over all of the properties of an array. Unfortunately, for in makes no guarantee about the order of the properties...</p>
  </blockquote>
  
  <p>As far as I know the "each" functions are based in <code>for in</code>, then does <code>each</code> function form JQuery and Underscore libraries guarantee order when they iterate over an Array? I'm trying to avoid the annoying standard <code>for</code>.</p>
  
  <p>Thank you in advance.</p>