Return value for function instead of inner function in Array.forEach

Question

I am using this code to check if something is valid

function isValid(source, target) {
  arr.forEach(function (el) {
    if (el.value === 3) {
      return false;
    }
  });

  return true;
}

The problem is that the return false line of code will only terminate the inner function in forEach and not the entire isValid function.

How do I terminate the outer function?

Answer 1

Use Array#every for checking the elements

function isValid(source, target) {
    return arr.every(function (el) {
        return el.value !== 3;
    });
}

The same with Array#some

function isValid(source, target) {
    return !arr.some(function (el) {
        return el.value === 3;
    });
}