Html page lifecycle Javascript events explained.
DOMContentLoaded, load, beforeunload, unload.
Clean Code concepts adapted for JavaScript
Software engineering principles, from Robert C. Martin’s book Clean Code, adapted for JavaScript. This is not a style guide. It’s a guide to producing readable, reusable, and refactorable software in JavaScript.Not every principle herein has to be strictly followed, and even fewer will be universally agreed upon. These are guidelines and nothing more, but they are ones codified over many years of collective experience by the authors of Clean Code.
Source: ryanmcdermott/clean-code-javascript: Clean Code concepts adapted for JavaScript
npm- Specifying dependencies and devDependencies in a package.json file
Install packages required by your application in production:
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npm install [package name] |
Install packages that are only needed for local development and testing:
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npm install [package name] --save-dev |
NPM cheat sheet:
https://kapeli.com/cheat_sheets/npm.docset/Contents/Resources/Documents/index
Specifying dependencies and devDependencies in a package.json fileTo specify the packages your project depends on, you must list them as “dependencies” or “devDependencies” in your package’s package.json file. When you (or another user) run npm install, npm will download dependencies and devDependencies that are listed in package.json that meet the semantic version requirements listed for each. To see which versions of a package will be installed, use the semver calculator.”dependencies”: Packages required by your application in production.”devDependencies”: Packages that are only needed for local development and testing.
To specify the packages your project depends on, you must list them as "dependencies" or "devDependencies" in your package’s package.json file. When you (or another user) run npm install, npm will download dependencies and devDependencies that are listed in package.json that meet the semantic version requirements listed for each. To see which versions of a package will be installed, use the semver calculator.
"dependencies": Packages required by your application in production."devDependencies": Packages that are only needed for local development and testing.
Source: Specifying dependencies and devDependencies in a package.json file | npm Documentation
mockserver – npm
mockserver is a library that will help you mocking your APIs in a matter of seconds: you simply organize your mocked HTTP responses in a bunch of mock files and it will serve them like they were coming from a real API; in this way you can write your frontends without caring too much whether your backend is really ready or not.
Source: mockserver – npm
Convert HTML + CSS to PDF. Print HTML in seconds
How to Update npm Packages to their Latest Version – HostingAdvice.com
Javascript debugging helper – Count number of eventlisteners in Chrome console
Paste and run one of the code blocks below in chrome console to get eventlisteners count.
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//eventlisteners counter - grouped summary Array.from(document.querySelectorAll('*')) .reduce(function(pre, dom){ var evtObj = getEventListeners(dom) Object.keys(evtObj).forEach(function (evt) { if (typeof pre[evt] === 'undefined') { pre[evt] = 0 } pre[evt] += evtObj[evt].length }) return pre }, {}) //_------------------------------------------- // //eventlisteners - totalcount var totalCount = 0; Array.from(document.querySelectorAll('*')).reduce(function(pre, dom){ var evtObj = getEventListeners(dom) Object.keys(evtObj).forEach(function (evt) { if (typeof pre[evt] === 'undefined') { pre[evt] = 0 } // pre[evt] += evtObj[evt].length totalCount += evtObj[evt].length; }) return totalCount; }, {}) //--------------------------------------- |
jasmine parameterized unit test – Stack Overflow
Based on piotrek’s answer and the article Parameterized testing in Javascript, you could also use the following approach which uses ES6 syntax:
I have tested it with the Jest test framework, but it should work with Jasmine as well.
How to use underscore lib from DefinitelyTyped with typescript? – Stack Overflow
Step 1. install type definitions (e.g. vs code intellisense) to project:
npm install –save @types/underscore
(https://www.npmjs.com/package/@types/underscore)
Step 2. import to ts file:
import * as _ from “underscore”;
Source: How to use underscore lib from DefinitelyTyped with typescript? – Stack Overflow
TypeScript vs. C#: LINQ
TypeScript counterparts for C# LINQ.
Source: TypeScript vs. C#: LINQ