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
const _ = require("lodash");
function number(n) {
return n % 5 == 0;
}
console.log(
_.filter([4, 6, 10, 15, 18],
_.negate(number))
);
|
Output:
[4, 6, 18]
Example 2:
Javascript
const _ = require("lodash");
function isOdd(n) {
return n % 2 != 0;
}
console.log(
_.filter([2, 4, 7, 12, 16, 19],
_.negate(isOdd))
);
|
Output:
[2, 4, 12, 16]