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Lodash _.negate


The lodash _.negate method is a function that returns a new function that negates the result of the provided function. In other words, it returns a new function that returns the opposite boolean value of the passed function. The _.negate function takes only one argument, which is the function to be negated.

The _.negate method is part of the popular lodash library, which provides utility functions for common programming tasks. This library is especially useful for functional programming in JavaScript.

The syntax for using _.negate is as follows:


Where predicate is the function to be negated.

Here's an example that shows how _.negate can be used to filter an array of numbers:

const numbers = [1, 2, 3, 4, 5, 6];

// get all even numbers
const evenNumbers = _.filter(numbers, _.negate(_.isEven));
// [1, 3, 5]

In this example, the _.negate method is used to create a new function that negates the _.isEven function, which checks if a given number is even.

The resulting function is then passed to the _.filter method, which returns a new array of all numbers in the original array for which the negated function returned true.

Overall, the lodash _.negate method is a powerful and easy-to-use tool for creating a new function that negates the result of another function. It's a great way to streamline your code and make it more readable and efficient.