Lodash _.not() Method
The Lodash _.not() method returns a boolean value which is the opposite of the truthiness boolean value of the given value.
Syntax:
_.not( value );
Parameters: This method takes one parameter as mentioned above and described below:
- 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 lodash.js contrib library to be installed. Lodash.js contrib library can be installed using npm install lodash-contrib –save.
Example 1:
Javascript
// Defining lodash contrib variable var _ = require('lodash-contrib'); var bool = _.not( true ); console.log("Opposite boolean value 'true' is : ", bool); var bool = _.not( false ); console.log("Opposite boolean value 'false' is : ", bool); |
Output:
Opposite boolean value 'true' is : false Opposite boolean value 'false' is : true
Example 2:
Javascript
// Defining lodash contrib variable var _ = require('lodash-contrib'); var bool = _.not( 0 ); console.log("Opposite boolean value '0' is : ", bool); var bool = _.not( 1 ); console.log("Opposite boolean value '1' is : ", bool); var bool = _.not( 10 ); console.log("Opposite boolean value '10' is : ", bool); |
Output:
Opposite boolean value '0' is : true Opposite boolean value '1' is : false Opposite boolean value '10' is : false
Example 3:
Javascript
// Defining lodash contrib variable var _ = require('lodash-contrib'); var bool = _.not( {} ); console.log("Opposite boolean value empty object is : ", bool); var bool = _.not( {'G' : "zambiatek"} ); console.log("Opposite boolean value object is : ", bool); var bool = _.not( null ); console.log("Opposite boolean value 'null' is : ", bool); |
Output:
Opposite boolean value empty object is : false Opposite boolean value object is : false Opposite boolean value 'null' is : true
