- Prototype Tutorial
- Prototype - Home
- Prototype - Short Overview
- Prototype - Useful Features
- Prototype - Utility Methods
- Prototype - Element Object
- Prototype - Number Processing
- Prototype - Strings Processing
- Prototype - Array Processing
- Prototype - Hash processing
- Prototype - Basic Object
- Prototype - Templating
- Prototype - Enumerating
- Prototype - Event Handling
- Prototype - Form Management
- Prototype - JSON Support
- Prototype - AJAX Support
- Prototype - Expressing Ranges
- Prototype - Periodical Execution
- Prototype Useful Resources
- Prototype - Quick Guide
- Prototype - Useful Resources
- Prototype - Discussion
Prototype - indexOf() Method
This method returns the position of the first occurrence of the argument within the array. If the argument doesn't exist in the array, returns -1.
NOTE − First index of the Array starts from zero.
Syntax
array.indexOf(value);
Return Value
Returns the position of the first occurrence of the argument within the array. If the argument doesn't exist in the array, returns -1.
Example
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showResult() { var arr = [3, 5, 6, 1, 20]; alert("Found position : " + arr.indexOf(6) ); } </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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