"waiting" On Either A Promise Or Regular Object Using Native(es6) Javascript Promises

I played with promises a few times a few years ago using either jQuery or Q. I'm now quite rusty and want to learn and use the new native ES6 promises. I seem to remember one neat

Solution 1:

Both jQuery's $.when() and ES6's Promise.all() exhibit the behaviour you refer to. Provide a promise and the function waits for the promise to resolve, but for any other value it returns immediately.