JS returning a promise - Syntax

promise.js

   function myCoolPromise() {
        return new Promise(function (resolve, reject) {
            //do some async things
            const data = "this_is_so_async";
            //if successfull
            resolve(data);
            //if not
            reject("error");
        });
    }

function wait = ms => {
        return new Promise(resolve => setTimeout(resolve, ms))
    }