- 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 - unset() Method
This method deletes the hash key's property and returns its value. If it does not find that key in the hash, then it does nothing and returns undefined.
Syntax
hash.unset(key);
Return Value
Returns value of the deleted key.
Example
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showResult() { var h = new Hash({ a: 'apple', b: 'banana', c: 'coconut' }); // Returns 'apple' alert( "h.unset('a') : " + h.unset('a') ); } </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_hash_processing.htm
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