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 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...
I want to write a function which returns me a component wrapped up in another. The function I'm trying to write is like below in JavaScript.  function GetGroup({ name, text, isRequired, ...props })    Here, name, text, and isRequired is obtained...
I read that async functions marked by the async keyword implicitly return a promise:  async function getVal(){  return await doSomethingAync(); }  var ret = getVal(); console.log(ret);   but that is not coherent...assuming doSomethingAsync() returns...
I have:  const props = {   gallery: [],   select: () => null,   one: 1,   two: 2, }   I can destructure it with:  const {gallery, select, ...other} = props   I will have three variables now:   gallery = [] select = () => null other = {one: 1,tw...
Suppose I have a function that takes a generator and returns another generator of the first n elements:   const take = function * (n, xs) {   console.assert(n >= 0);   let i = 0;   for (const x of xs) {     if (i == n) {       break;     }     yie...

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