30-seconds-of-code/snippets/negate.md

negate

Negates a predicate function.

Take a predicate function and apply the not operator (!) to it with its arguments.

const negate = func => (...args) => !func(...args);

[1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 == 0)); // [ 1, 3, 5 ]