How to use the negate function from underscore

Find comprehensive JavaScript underscore.negate code examples handpicked from public code repositorys.

underscore.negate is a function that returns a new function that negates the result of the original function.

leaflet-measure.js

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};

 // Return a copy of the object without the blacklisted properties.
_.omit = function(obj, iteratee, context) {
  if (_.isFunction(iteratee)) {
    iteratee = _.negate(iteratee);
  } else {
    var keys = _.map(flatten(arguments, false, false, 1), String);
    iteratee = function(value, key) {
      return !_.contains(keys, key);

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How does underscore.negate work?

Underscore's negate function returns a new function that, when called, will return the opposite of the boolean value returned by the original function passed to negate.

Ai Example

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const _ = require("underscore");

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

const isOdd = _.negate(isEven);

console.log(isOdd(3)); // Output: true
console.log(isOdd(4)); // Output: false

In this example, isEven is a function that takes a number as an argument and returns true if it's even, and false otherwise. We use _.negate to create a new function isOdd that returns the opposite of isEven. When we call isOdd with an argument, it first calls isEven with that argument and then negates the result.

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