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Look at the code first:

function wrapper(generatorFunction) {
    return function (...args) {
        let generatorObject = generatorFunction(...args);
        generatorObject.next();
        return generatorObject;
    };
}

const wrapped = wrapper(function* () {
    console.log(`First input: ${yield}`);
    return 'DONE';
});

wrapped().next('hello!')
// First input: hello!

How to understand this output result? After thinking for a long time, I couldn't understand the results of his operation.
There is also the following code:

function* dataConsumer() {
  console.log('Started');
  console.log(`1. ${yield}`);
  console.log(`2. ${yield}`);
  return 'result';
}

let genObj = dataConsumer();
genObj.next();
// Started
genObj.next('a')
// 1. a
genObj.next('b')
// 2. b

I still don’t understand, please help me analyze the above two pieces of code and help me learn the Generator function. Thank you.