Prototype - Enumerable select() Method


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This method returns all the elements for which the iterator returned true. This is an alias of findAll().

The optional context parameter is what the iterator function will be bound to. If used, the this keyword inside the iterator will point to the object given by the argument.

Syntax

Iterator.select([context]);

Return Value

Returns all the elements for which the iterator returned true.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var arr = $R(1, 10).select(function(n) { return 0 == n % 2; });

            alert("Test 1 : " + arr.inspect() );
            // Returns [2, 4, 6, 8, 10]

            var arr = [ 'world', 'this', 'is', 'nice'].select(function(s) {
               return s.length >= 5;
            })
            
            alert("Test 2 : " + arr.inspect() );
            // Returns ['world']
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      <br />
      <br />
      <input type = "button" value = "Result" onclick = "showResult();"/>
   </body>
</html>

Output

prototype_enumerating.htm
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