Memoization of promise-based function

Question

How can I memoize a promise-based function?

Would straightforward memoization of the function suffice?

function foo() {
    return new Promise((reso         


        

Answer 1

Note that your function has the deferred anti pattern and can be simplified further:

foo.value = null;
function foo(){
    if(foo.value) return foo.value;
    return (foo.value = doSomethingAsync());
}

That is, memoization is so simple in this case you don't even have to call .memoize. Also your original function suppressed errors.