You can create scope blocks around your cases, and the compiler will be happy: switch (1) { case 1: { // notice these extra curly braces const foo = 1; break; } case 2: { const foo = 2; break; } } Read the answer from Igor if you need more context.
New webpack-dev-server is released, and it supports writeToDisk option. devServer: { writeToDisk: true }
You seem to be operating under a misconception that there are two objects A and B when you are in the constructor of the derived class B. This is not the case at all. There is one and only one object. Both A and B contribute properties and methods to that one object. The value … Read more
Anything can be used as a key in a map. Maps are ordered, and that allows for iteration. Combining 1 and 2, when you iterate over a map, you’ll get a useful array of key-value pairs! Check out the map.prototype.forEach() documentation. Source: Another good question/answer exchange. Worth marking this one as a duplicate. Update: Adding … Read more
Code-wise, there is no specific disadvantage. JS engines are smart enough to not have performance differences between a string literal and a template literal without variables. In fact, I might even argue that it is good to always use template literals: You can already use single quotes or double quotes to make strings. Choosing which … Read more
You could use Array.from() instead: Thanks to Pranav C Balan in the comments for the suggestion on further improving this. let m = Array.from({length: 6}, e => Array(12).fill(0)); m[0][0] = 1; console.log(m[0][0]); // Expecting 1 console.log(m[0][1]); // Expecting 0 console.log(m[1][0]); // Expecting 0 Original Statement (Better optimized above): let m = Array.from({length: 6}, e => … Read more
No, you can’t use yield inside of the inner function. But in your case you don’t need it. You can always use for-of loop instead of forEach method. It will look much prettier, and you can use continue, break, yield inside it: var trivialGenerator = function *(array) { for (var item of array) { // … Read more
You use its size property. Both Maps and Sets have it (here and here). const populatedSet = new Set([‘foo’]); console.log(populatedSet.size); // 1 const populatedMap = new Map([[‘foo’, 1]]); console.log(populatedMap.size); // 1 (Side note: WeakMaps and WeakSets don’t have size or several other features their “strong” counterparts have, in order to keep their implementations, and code … Read more
The next method exists on the generator that the function returns, not on the generator function itself. export default class GeneratorClass { constructor() { const iterator = this.generator(10); iterator.next(); } *generator(count:number): IterableIterator<number> { while(true) yield count++; } }
You should not use externals: [nodeExternals()], in web app. According to https://github.com/liady/webpack-node-externals it is only for backend. Since you use nodeExternals in web app you get CommonJS modules, that expects built in node require function. So just remove it to fix error.