Short answer: this points at the nearest bound this – in the code provided this is found in the enclosing scope. Longer answer: Arrow functions do not have this, arguments or other special names bound at all – when the object is being created the name this is found in the enclosing scope, not the … Read more
You’ll want to create a new instance of Axios with a custom config for each API you want that has a distinct baseURL. var instance = axios.create({ baseURL: ‘https://example.com/api/’, timeout: 1000, headers: {‘X-Custom-Header’: ‘foobar’} });
As mentioned by PitaJ, the type symbol here is not part of ES6 or any earlier version of JavaScript, but rather part of the Flow static type checker. Here are the docs for the type symbol.
Every route has an onEnter hook which is called before the route transition happens. Handle the onEnter hook with a custom requireAuth function. <Route path=”/search” component={Search} onEnter={requireAuth} /> A sample requireAuth is shown below. If the user is authenticated, transition via next(). Else replace the pathname with /login and transition via next(). The login is … Read more
If you have Resharper installed in your VS 2013 – from today on you can switch to using ES6:
No. Not only will .done likely not be supported in the future versions of the spec – it is unneeded. Quoting from the threads Mariusz linked to: Domenic: it’s still error-prone: if you slip up and don’t follow the rule even once, you might silence an error forever. Mark Miller (who pioneered the concept of … Read more
If your intention is to some other scope, iterate over it, do some other stuff, then be able to iterate over it again later on in that same scope. Then the only thing you shouldn’t try doing is passing the iterator, instead pass the generator: var generator = function*() { yield 1; yield 2; yield … Read more
If you want to ensure that the value is not only a function, but really a constructor function for a class, you can convert the function to a string and inspect its representation. The spec dictates the string representation of a class constructor. function isClass(v) { return typeof v === ‘function’ && /^\s*class\s+/.test(v.toString()); } Another … Read more
Going forward, it’s probably better to export multiple functions, as tree shaking allows module bundlers to eliminate dead code based on whether it’s been imported or not. If you export one large object, it’s not always possible to use static analysis to tell which functions need to be kept and which can be safely discarded. … Read more
ES6 classes inherit from each other. So when instance.constructor refers to the Child, then you can use Object.getPrototypeOf(instance.constructor) to get the Parent, and then access .name: Object.getPrototypeOf(instance.constructor).name // == “Parent” Of course, full ES6 compliance and non-minified code are necessary for this to work. You should never rely on function names in code.