Is the value of the property key answers[value] being retrieved as a variable on a global scale?

Does the function isPrime have a property known as answers and another property key named value? If isPrime.answers[value] yields [value] after the execution of the function, does [value] become both a variable outside of its original function scope and simultaneously a property key within the answers object?

function isPrime(value) {
  if (!isPrime.answers) {
    isPrime.answers = {};
  }

  if (isPrime.answers[value] !== undefined) {
    return isPrime.answers[value];
  }

  var prime = value !== 1; // 1 is not a prime

  for (var i = 2; i < value; i++) {
    if (value % i === 0) {
      prime = false;
      break;
    }
  }
  return isPrime.answers[value] = prime;
}

Answer №1

Does [value] exist as a key in the answers object?

Absolutely, it does. The value associated with that key is prime.

Has [value] become a variable outside of its original function scope now?

No, it hasn't. The final line

 return isPrime.answers[value] = prime;

is essentially the same as:

 isPrime.answers[value] = prime;
 return prime;

This means that it stores the boolean value of prime within the object (using the key found in value) and then returns it. When a variable is returned from a function, it doesn't change the variable itself - only its value is retrieved.

Both value and prime are confined as local variables within the isPrime function.

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