warmup8 min

Implement negate(predicate)

Implement `negate(predicate)`

Write negate(predicate) that returns a new predicate function which returns the boolean opposite of predicate, forwarding whatever arguments it's called with.

const isEven = (n) => n % 2 === 0;
const isOdd = negate(isEven);
[1, 2, 3, 4].filter(isOdd); // [1, 3]

Your code

Results

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Stuck? This challenge exercises:

javascript.functional-programming