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Lodash _.negate() Method

  • Last Updated : 13 Sep, 2020

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.

The _.negate() method used to create a function that negates the result of the given predicate function.

Syntax:

_.negate( predicate )

Parameters: This method accepts a single parameter as mentioned above and described below:

  • predicate: This parameter holds the predicate function to negate.

Return Value: This method returns the new negated function.

Example 1:

Javascript




// Requiring the lodash library  
const _ = require("lodash");  
  
// Function to check the number
// is divisible by 5 or not
function number(n) {
  return n % 5 == 0;
}
   
// Using the _.negate() method  
console.log(
  _.filter([4, 6, 10, 15, 18], 
  _.negate(number))
);

Output:

[4, 6, 18]

Example 2:  

Javascript




// Requiring the lodash library  
const _ = require("lodash");  
  
// Function to check the
// number is odd or not
function isOdd(n) {
  return n % 2 != 0;
}
   
// Using the _.negate() method  
console.log(
  _.filter([2, 4, 7, 12, 16, 19],
  _.negate(isOdd))
);

Output:

[2, 4, 12, 16]
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