Iterator.prototype.some()

some(callbackFn)

function* fibonacci() {
  let current = 1;
  let next = 1;
  while (true) {
    yield current;
    [current, next] = [next, current + next];
  }
}

const isEven = (x) => x % 2 === 0;
console.log(fibonacci().some(isEven)); // true

const isNegative = (x) => x < 0;
const isPositive = (x) => x > 0;
console.log(fibonacci().take(10).some(isNegative)); // false
console.log(fibonacci().some(isNegative)); //   

const seq = fibonacci();
console.log(seq.some(isEven)); // true
console.log(seq.next()); // { value: undefined, done: true }