Underscore.js _.not() Method
Last Updated :
05 Aug, 2020
The _.not() method returns a boolean value which is the opposite of the truthiness boolean value of the given value.
Syntax:
_.not( value );
Parameters:
- value: Given value for returning opposite boolean.
Return Value: This method returns a Boolean value.
Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed. Underscore.js contrib library can be installed using npm install underscore-contrib –save.
Example 1: It returns false for this method.
Javascript
var _ = require( 'underscore-contrib' );
var bool = _.not( true );
console.log( "Opposite boolean value if"
+ " value's truthiness is : " , bool);
|
Output:
Opposite boolean value if value's truthiness is : false
Example 2: For false, this method returns opposite value that is true.
Javascript
var _ = require( 'underscore-contrib' );
var bool = _.not( false );
console.log( "Opposite boolean value if"
+ " value's truthiness is : " , bool);
|
Output:
Opposite boolean value if value's truthiness is : true
Example 3: For existing values, this method returns false.
Javascript
var _ = require( 'underscore-contrib' );
var bool = _.not( "Geeks" );
console.log( "Opposite boolean value if"
+ " value's truthiness is : " ,bool);
|
Output:
Opposite boolean value if value's truthiness is : false
Example 4: for non-existing values, this method returns true.
Javascript
var _ = require( 'underscore-contrib' );
var bool = _.not( null );
console.log( "Opposite boolean value if"
+ " value's truthiness is : " , bool);
|
Output:
Opposite boolean value if value's truthiness is : true
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...