我将如何创建逆序高阶函数？

Question

I need to create a higher-order function called invert. It should do the following:

Return a new function. Take a function as its only argument. The inner function should take any number of arguments and inverts a call to the passed function.

What I have so far is just http://prntscr.com/l0rma0 but it only works for functions with no arguments.

Answer 1

Hopefully, this should be enough:

function invert(fn) {
  return (...args) => !fn(...args);
}

Here's the test case:

 function invert(fn) { return (...args) => !fn(...args); } // test 1 const returnsTrue = () => true; const returnsFalse = invert(returnsTrue); console.log( returnsFalse() === false ); // test 2 const isEven = x => x % 2 === 0; const isOdd = invert(isEven); console.log( isOdd(13) === true ); console.log( isOdd(10) === false ); // test 3 const isSumBiggerThan100 = (...args) => args.reduce((acc, val) => acc + val) > 100; const isSumLessThanOrEqualTo100 = invert(isSumBiggerThan100); console.log( isSumLessThanOrEqualTo100(10, 3, 8, 5, 4, 20) === true); console.log( isSumLessThanOrEqualTo100(70, 10, 50, 23) === false) 

Answer 2

const higherFunction = (something) => {
  return function innerFunc(...params) {
    return !something;
  }
};

Do you mean something like that ?