Mohan mohan-mu

Articles for the New JS Dev

A list of the gists that have proved most useful to new JS devs on GitHub.

Free to read online: exploringjs.com/impatient-js/

The exercises now run as native ESM modules on Node.js. Previously, they were run via the esm package.
Material on new ES2021 features:
- String.prototype.replaceAll()
- Promise.any()
- Logical assignment operators
Underscores (_) as separators in number literals and bigint literals

	import { AbstractControl, FormArray, FormGroup } from '@angular/forms';
	import { map, toPairs, fromPairs, differenceWith, isEqual, isNull, isUndefined } from 'lodash';
	import { Observable, OperatorFunction, defer, empty, of, merge, pipe } from 'rxjs';
	import { distinctUntilChanged, filter, map, shareReplay, pairwise } from 'rxjs/operators';

	/**
	* Convenience RxJS operator that filters out undefined & null and modifies the downstream type
	* appropriately.
	*/
	export function exists<T>(): OperatorFunction<T \| undefined \| null, T> {

	const ids = [];
	const data = ['139', '576'];

	data.map(id => ids.push(Math.max(...id)));

	// What's the output?
	console.log(ids);