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

As @Bergi, and @BenjaminGruenbaum have pointed out, yes memoization is fine here, but it should be pointed out that your foo function is doing nothing useful and is actually introducing bugs (see: deferred antipattern).

If all you want is to memoize the result of doSomethingAsync, then you can cut out the middle-man:

var fooMemoized = memoize(doSomethingAsync);

Or if you were actually oversimplifying and foo() is passing arguments to doSomethingAsync, then you can still reduce it to one line:

function foo() {
    return doSomethingAsync(argument1, argument2, etc.);
}
var fooMemoized = memoize(foo);

Or if you don't actually plan to use foo(), you can do:

var fooMemoized = memoize(function () {
    return doSomethingAsync(argument1, argument2, etc.);
});