Prototype - reduce() Method


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This method reduces arrays: one-element arrays are turned into their unique element, while multiple-element arrays are returned untouched.

Syntax

array.reduce();

Return Value

  • If it is one-element array, then it turned into their unique element.
  • If it is multi-elements array, then it remains untouched.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var arr = [10];
            alert("Reduced Element : "  + arr.reduce());
            
            var arr = [10, 20, 30, 40];
            alert("Reduced Element : "  + arr.reduce().inspect());
         }
      </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_array_processing.htm

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