Retrieve the following value in a series without relying on a generator function when the button is clicked using javascript

My goal is to capture the subsequent unique values within a factorial sequence upon clicking a button.

To achieve this, I have defined a factorialSeq() function along with a generator() function. The generator function takes the factorialSeq() as an argument. When the button is clicked, I successfully retrieve the first value in the sequence. However, all values in the sequence are returned correctly when logged to the console.

<button style="padding: 20px" id="nextBtn">Next</button>

<script>

    let nextBtn = document.getElementById('nextBtn');

    function generator(sequencer) {
        const seqArgs = [...arguments];
        seqArgs.shift();
        const seq = sequencer(...seqArgs);
        return {
            next() {
                return seq();
            }
        }
    }

    function factorialSeq() {
        let currentNumber = 1;
        let result;
        return function factorialReturn() {
            if (!result) {
                result = 1;
                return result;
            }

            result *= currentNumber;
            currentNumber += 1;
            return result;
        }
    }

    nextBtn.addEventListener('click', function () {
        var gen = generator(factorialSeq);

        console.log(gen.next());
        // console.log(gen.next());
        // console.log(gen.next());
        // console.log(gen.next());
    });
</script>

I anticipate a different output each time I click the button (i.e., the next value in the sequence). It is pertinent to note that I do not wish to utilize the built-in generator function in JavaScript. Thank you!

Answer №1

When I clicked the button, I found that I could only capture the initial value in the sequence

The reason for this is that you are generating a new sequence each time the button is clicked, and only logging the first value. To fix this issue, try the following:

var seq = generator(factorialSeq);
nextBtn.addEventListener('click', function () {
    console.log(seq.next());
});

Answer №2

The issue at hand was that the generator function was being redefined every time the #next button was clicked. To resolve this, you can modify the code as follows:

let nextButton = document.getElementById('nextBtn');
let resetButton = document.getElementById('resetBtn');

    function createGenerator(sequencer) {
        const seqArgs = [...arguments];
        seqArgs.shift();
        const sequence = sequencer(...seqArgs);
        return {
            next: () => {
                return sequence();
            }
        }
    }

    function factorialSequence() {
        let currentNum = 1;
        let resultValue;
        return function getFactorialValue() {
            if (!resultValue) {
                resultValue = 1;
                return resultValue;
            }

            resultValue *= currentNum;
            currentNum += 1;
            return resultValue;
        }
    }
    
    var genInstance = createGenerator(factorialSequence);
    nextButton.addEventListener('click', function () {

        console.log(genInstance.next());
    });
    resetButton.addEventListener('click', function () {
        genInstance = createGenerator(factorialSequence);
    });
<button style="padding: 20px" id="nextBtn">Next</button>
<button style="padding: 20px" id="resetBtn">Reset</button>

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