Tips on how to navigate back to the parent function context from a child function

I am looking for the return value to impact the parent function, like so:

  const blockLetters = lastD => {
    if(lastD != undefined && isNaN(Number.parseInt(lastD))){
      return;

    }
  }

const handleCVC = e => {
    e.preventDefault();
    let newcvc = e.target.value;
    let newcvcArr = newcvc.split("");
    let newLength = (e.target.value).length;
    let lastNewDigit = newcvcArr[newLength-1]

    blockLetters(lastNewDigit);

    setcvc(newcvc)


  }

The goal is for the returns from blockLetters to directly affect the handleCVC function, preventing it from executing its final line. However, currently these returns only impact the blockLetters function itself.

Answer №1

To determine if a valid value is not present for checking and returning in a calling function, you can use a function that returns either true or a truthy value.

Essentially, this can be achieved by utilizing the isNaN method instead of creating a separate dedicated function for the same purpose.

const isNoNumber = lastDigit => isNaN(Number.parseInt(lastDigit, 10));

const handleCVC = event => {
    event.preventDefault();
    let cvcValue = event.target.value;
    let cvcArray = cvcValue.split("");
    let length = (event.target.value).length;
    let lastDigit = cvcArray[length - 1];

    if (isNoNumber(lastDigit)) return;

    setCVC(cvcValue);
}

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