Backbone.JS Unset()

The Backbone.JS Unset() model removes an attribute from a backboneJS model.

Syntax:

Model.Unset(attribute)   

Parameters:
attribute: This parameter is used to define properties of a model.

Example:

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<title>Example</title>
<script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
<script type="text/javascript">
var X = Backbone.Model.extend();
var Y=new X();
Y.set({ MSG: "HELLO WORLD"});
document.write("<b>Message after SET:</b> ", Y.get('MSG'));
Y.unset('MSG');
document.write("<br>");
document.write("<b> Message after UNSET:</b> ", Y.get('MSG'));
</script><b>Message after SET:</b> HELLO WORLD<br><b> Message after UNSET:</b> undefined
<!-- Mirrored from www.w3schools.blog/backbonejs-unset by HTTrack Website Copier/3.x [XR/YP'2000] -->
<title>Example</title> <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script> <script type="text/javascript"> var X = Backbone.Model.extend(); var Y=new X(); Y.set({ MSG: "HELLO WORLD"}); document.write("<b>Message after SET:</b> ", Y.get('MSG')); Y.unset('MSG'); document.write("<br>"); document.write("<b> Message after UNSET:</b> ", Y.get('MSG')); </script><b>Message after SET:</b> HELLO WORLD<br><b> Message after UNSET:</b> undefined <!-- Mirrored from www.w3schools.blog/backbonejs-unset by HTTrack Website Copier/3.x [XR/YP'2000] -->
  
  
  
Example  
  
  
  
Message after SET: HELLO WORLD
Message after UNSET: undefined

Output:

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Message after SET: HELLO WORLD
Message after UNSET: undefined
Message after SET: HELLO WORLD Message after UNSET: undefined
Message after SET: HELLO WORLD
Message after UNSET: undefined

Explanation:
After UNSET the message is undefined.