javaScript.fnObjCacheFn.js - the function cache itself with its own property.

javaScript.fnObjCacheFn.js

function isPrime(value) {
    if (!isPrime.anwers) isPrime.answers = {};
    if (isPrime.answers[value] != null) {
        return isPrime.answers[value];
    }
    var prime = value != 1; // 1 can never be prime
    for (var i = 2; i < value; i++) {
        if (value % i == 0) {
            prime = false;
            break;
        }
    }
    return isPrime.answers[value] = prime;
}
assert(isPrime(5), "5 is prime!");
assert(isPrime.answers[5], "The answer was cached!");