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Array Functions

Submitted by fireflymantis on Wed, 06/06/2007 - 12:18.

This Document is Out of Date. For the current documentation, please see http://docs.dojocampus.org/

Along with dojo.forEach, Dojo provides other array functions which mimic JavaScript 1.6 functionality. And that's good news for IE users, who don't have the luxury of JavaScript 1.6 yet.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
            "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Array Examples</title>
        <script type="text/javascript"
            src="http://o.aolcdn.com/dojo/1.0.0/dojo/dojo.xd.js"></script>
        <script type="text/javascript">
       dojo.addOnLoad(function(){
           // JavaScript is so important, it's listed twice!
           var webLanguages = ["JavaScript", "PHP", "Rails", "JavaScript", "JSP", "ASP.NET"];
           
           // indexOf and lastIndexOf are like the String functions
           console.debug(dojo.indexOf(webLanguages, "JavaScript")); // = 0
           console.debug(dojo.indexOf(webLanguages, "Javascript")); // = -1 - case sensitive!
           console.debug(dojo.lastIndexOf(webLanguages, "JavaScript")); // = 3
           
           // Apply function to each element and return a matching output array.
           console.dir(
               dojo.map(webLanguages,
                  function(elem) { return elem.length; }
               )
           );   // Returns [10, 3, 5, 10, 3, 7]
           
           // Filter applies a boolean function and returns an array of elements that match
           console.dir(
               dojo.filter(webLanguages,
                  function(elem) { return elem.substring(0,1) == 'J'; }
               )
           );   // Returns ["JavaScript", "JavaScript", "JSP"]
           
           // 'Every' and 'some' applies a boolean function to each element and returns true
           // if function is true for all (every) or at least one (some)
           console.debug(
               dojo.every(webLanguages,
                  function(elem) { return elem > 'BASIC'; }
               )
           );   // Returns false because ASP.NET is less than
                // BASIC (technical arguments aside...)
           console.debug(
               dojo.some(webLanguages,
                  function(elem) { return elem.length < 4; }
               )
           );   // Returns true because length of JSP and PHP are less than  4
       });
     </script>
</head>
</html>
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Error in filter comment

Submitted by MED on Thu, 02/21/2008 - 14:50.

Looks like the filter item incorrectly lists "PHP" as a result:
// Returns ["JavaScript", "JavaScript", "PHP"]
probably should be
// Returns ["JavaScript", "JavaScript", "JSP"]