What you’re looking at is a destructuring assignment. It’s a form of pattern matching like in Haskell. Using destructuring assignment you can extract values from objects and arrays and assign them to newly declared variables using the object and array literal syntax. This makes code much more succinct. For example: var ascii = { a: … Read more
Use the constructor to clone Maps and Sets: var clonedMap = new Map(originalMap); var clonedSet = new Set(originalSet);
One can create an empty array, fill it (otherwise map will skip it) and then map indexes to values: Array(8).fill(0).map((_, i) => i * i);
JavaScript has the concept of “run to completion”. Unless an error is thrown, a function is executed until a return statement or its end is reached. Other code outside of the function can’t interfere with that (unless, again, an error is thrown). If you want resolve() to exit your initializer function, you have to prepend … Read more
The error is telling you that you are importing incorrectly. Here’s the code you have to add: import { Home } from ‘./layouts/Home’; This is incorrect because you’re exporting as the default export, not as a named export. Check this line: export default Home; You’re exporting as default, not as a name. Thus, import Home … Read more
export {default as Module} from ‘./Module/Module’; is the standard ES6 way, as long as you don’t need Module to also be available inside the module doing the exporting. export Module from ‘./Module/Module’; is a proposed ESnext way to do it, but that only works if you’ve enabled it in Babel for now.
So .map itself only offers one value you care about… That said, there are a few ways of tackling this: // instantiation const myMap = new Map([ [ “A”, 1 ], [ “B”, 2 ] ]); // what’s built into Map for you myMap.forEach( (val, key) => console.log(key, val) ); // “A 1”, “B 2” … Read more
I can’t really recommend this solution work-around but it does function. Rather than exporting an object, you use named exports each member. In another file, import the first module’s named exports into an object and export that object as default. Also export all the named exports from the first module using export * from ‘./file1’; … Read more
I feel like there must be some way to dynamically import all files from a specific directory as their name sans extension, and then use those files as needed. Not in ES6. The whole point of import and export is that dependencies can be determined statically, i.e. without executing code. But since you are using … Read more
The simplest and least performant way to do this is: Array.from(m).map(([key,value]) => /* whatever */) Better yet Array.from(m, ([key, value]) => /* whatever */)) Array.from takes any iterable or array-like thing and converts it into an array! As Daniel points out in the comments, we can add a mapping function to the conversion to remove … Read more