try this, ES6 Object.assign() to create copy of array element and update new object. let schools = [{ name: ‘YorkTown’, country: ‘Spain’ }, { name: ‘Stanford’, country: ‘USA’ }, { name: ‘Gymnasium Achern’, country: ‘Germany’ } ]; const editSchoolName = (schools, oldName, name) => { return schools.map(item => { var temp = Object.assign({}, item); if … Read more
Maps are iterable and ordered, but they are not arrays so they don’t have any indexed access. Iterating to the final element is the best you can do. The simplest case being Array.from(map.values()).pop();
You can get attribute value with evaluate method. await page.evaluate(‘document.querySelector(“span.styleNumber”).getAttribute(“data-Color”)’) Second way $$eval method can also be used. Also attributes called as Array from variable const attr = await page.$$eval(“span.styleNumber”, el => el.map(x => x.getAttribute(“data-Color”))); Output will be [“Blue”, “Green”, “Red”] Your solution const styleNumbers = await page.$$(“span.styleNumber”); for( let styleNumber of styleNumbers ) { … Read more
You seem to have the correct understanding of what happens with this in an arrow function. I will offer an explanation that I think adds to the conversation and hopefully solidifies your understanding. As you probably know, when you define a function and use a variable inside of it, it checks if the variable has … Read more
Sure, here’s how: const stuff = { data: { things: [1,2,3,4] } }; const getThings = ({ data: {things} }) => { console.log(things) }; getThings(stuff);
What you are seeing there is the string substitution patterns that are built into console.log() or console.debug(). The pattern goes as I have presented below: %s for a String %d or %i for Number %f for Floating points %o for an Object %j for an JSON So essentially you are replacing the specifier with the … Read more
Another interesting solution found here is using ES6 Map: export enum Sample { V, IV, III } export const SampleLabel = new Map<number, string>([ [Sample.V, ‘FIVE’], [Sample.IV, ‘FOUR’], [Sample.III, ‘THREE’] ]); USE console.log(SampleLabel.get(Sample.IV)); // FOUR SampleLabel.forEach((label, value) => { console.log(label, value); }); // FIVE 0 // FOUR 1 // THREE 2
This is a classic example where inverting your logic makes it much clearer. Your “race” in this case is that you want your rejection behavior to in fact be success behavior. function oneSuccess(promises){ return Promise.all(promises.map(p => { // If a request fails, count that as a resolution so it will keep // waiting for other … Read more
The problem is with source code (via source maps) to real code mapping. While the source is concise and dense, the generated code is typically longer and the mapping between the two isn’t (and probably cannot be) done in a way which will guarantee a 1:1 relationship between the two. So when you try to … Read more
In my opinion, the best practice is to publish both minified code in dist folder and also the source code in src folder. One should also include other files such as package.json, package-lock.json, README.md, LICENSE.txt, CONTRIBUTING.md, etc which are at the root package directory. To achieve this, one should use files property in package.json to … Read more