How one can write a function, which takes only few attributes in most-compact way in ES6?  I've came up with solution using destructuring + simplified object literal, but I don't like that list of fields is repeated in the code.  Is there a...
I'm looking at some ES6 code and I don't understand what the @ symbol does when it is placed in front of a variable. The closest thing I could find has something to do with private fields?  Code I was looking at from the redux library:  imp...
I am using ReactJS with Babel and Webpack and using ES6 as well as the proposed class fields for arrow functions. I understand that arrow functions make things more efficient by not recreating the functions each render similar to how binding in the...
Given   var arr = [1,2,true,4,{"abc":123},6,7,{"def":456},9,[10]]   we can filter number items within array arr using Number constructor  var res = arr.filter(Number); // [1, 2, true, 4, 6, 7, 9, Array[1]]   are true and [10] expected...
I'm trying to use ES7 async / await together with fetch. I know I'm close but I can't get it to work. Here is the code:  class Bar {     async load() {         let url =  'https://finance.yahoo.com/webservice/v1/symbols/goog/quote?for...
Can someone explain how Babel in React supports fat arrow functions as class properties? Using Babel Try it out I can see they are not supported:  class Question {    // Property (not supported)   myProp = () => {     return 'Hello, world!'...
I'm looking for a pure function, to modify my immutable state object. The original state given as parameter must stay untouched. This is especially useful when working with frameworks like Redux and makes working with immutable object in javascri...
There are already a lot of cool features in ES6/ES7 for defining Javascript objects. However, the following pattern is common in Javascript:  const obj = {    requiredKey1: ...,    requiredKey2: ...  };  if (someCondition) {    obj.optionalKey1 = ......
The only place it seems to be documented is this issue thread and the actual specification. However, the reasoning for the removal isn't posted anywhere I could find.  The new recommended way seems to be await Promise.all(), but I'm curious a...

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