Underscore.JS - negate method

Syntax

_.negate(predicate)

negate method returns a inverted version of a function passed.

Example

var _ = require('underscore');

var isEven = function(value) { return value % 2 == 0 };

var isOdd = _.negate(isEven);
console.log(isEven(2));
console.log(isOdd(2));

Save the above program in tester.js. Run the following command to execute this program.

Command

\>node tester.js

Output

true
false