title: Remove key/value pair from array of hashes
body: <p>Suppose I have an array of hashes</p>
  
  <pre><code>a = [
    {'id'=&gt;'1','imageUrl'=&gt;'abc','name'=&gt;'x','age'=&gt;'20'},             
    {'id'=&gt;'2','imageUrl'=&gt;'efg','name'=&gt;'y','age'=&gt;'30'},
    {'id'=&gt;'3','imageUrl'=&gt;'hij','name'=&gt;'z','age'=&gt;'40'}
  ]
  </code></pre>
  
  <p>What can be the fastest way to remove the key 'name' and 'age' and their corresponding value from all hashes in the array?</p>
  
  <p>Basically how can I remove multiple key/value pairs?</p>