title: specific element in array from array of object
body: <p>i have an array like</p>
  
  <pre><code>myArray = [{'id':'73','foo':'bar'},{'id':'45','foo':'bar'}, etc.]
  </code></pre>
  
  <p>How can i retrive an array with only id like?</p>
  
  <pre><code>myArrayResult = [73,45]
  </code></pre>
  
  <p>with jQuery or javascript.
  thanks</p>