const not = predicate => element => !predicate(element);

//Example
const numbers = [1,2,3,4,5,6,7,8,9,0];
const isBigThan5 = item => item > 5;
const notBigThan5 = not(isBigThan5);

const numbersBigThan5 = numbers.filter(isBigThan5);
const numbersNotBigThan5 = numbers.filter(notBigThan5);

console.log('numbersBigThan5', numbersBigThan5);
console.log('numbersNotBigThan5', numbersNotBigThan5);