This is correct: const bar = await Promise.all(promiseArray); await Promise.all([…]) takes an array of Promises and returns an array of results. bar will be an array: [‘hello’, …, ‘hello’] You can also deconstruct the resulting array: const [bar1, …, bar10] = await Promise.all(promiseArray); console.log(bar1); // hello console.log(bar7); // hello
You might just be missing the async keyword on line 48. Update your code to use the async keyword before the function keyword: renderScene: async function(route, nav) { try { const response = await signIn.isLoggedIn(); // … Or when using an arrow function, put the async keyword before the parameter list: renderScene: async (route, nav) … Read more
Babel v6 As of Babel v6, Babel doesn’t contain any transformers itself anymore. You have to explicitly specify any feature you want to transform. Presets – non ES2015 environment The quickest way to get this working is to use presets which already contain the set of plugins needed to transform ES2015 and newer proposals. For … Read more
I believe it’s a matter of personal preference. The transpiled output is the same in terms of semantics. Class Property Constructor
Is it the correct way to use while loops with asynchronous conditions? Yes. async functions simply suspend their execution on every await until the respective promises fulfills, and any control structures continue to work as before.
To execute a decorator, you evaluate an expression and doing that prevents hoisting (even for a variable declaration, the right-hand side of an assignment stays put). Therefore, it is not compatible with function declarations being hoisted. As a work-around, I suggested that function expressions, generator function expressions and arrow functions could be enabled to be … Read more
I understand that arrow functions make things more efficient by not recreating the functions each time they are referred to This is not true. Arrow functions handles the this context in a lexical way, where “normal” function do it dynamically. I wrote about the this key word in depth if you need more info about … Read more
There are roughly two categories of APIs here: pull and push. Pull Async pull APIs are a good fit for cases where data is pulled from a source. This source might be a file, or a network socket, or a directory listing, or anything else. The key is that work is done to pull or … Read more
You should only await on something that returns a Promise. I would definitely recommend reading up on Promises before you start working with async and await. You can probably get this example to work by creating your own wrapper function around request to make it return a promise, like so: function doRequest(url) { return new … Read more
I found the accepted answer was not enough to help me sort this out, so I’m adding a little more detail to help others who find this. The problem is that it’s unclear exactly what is the decorator. The decorator in the example given is not just the @ symbol, it’s the @connect function. Simply … Read more