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Today in Top Angular News – Wednesday, February 13

Today in Top Angular News – Wednesday, February 13

Today’s topics include typescript, angular, ITNEXT, Javascript, Angular6, React, FrontEndDevelopment, Web, 100daysofcode, reactjs, vuejs, angularjs, codenewbie, vscode, WebDevelopment, Angular2, EventManager, ui, and angularmaterial. Special thanks to contributors @Braga_28, André Braga, @albanx, Alban, @charleeli, Charlee Li, @dleroari, Dler Ari, @js_tut, JavaScript Teacher, nrwl, webcodegeeks, @stephenfluin, Stephen Fluin, ITNEXT_io, @s_eschweiler, Sebastian Eschweiler, chriskitson, coding_latte, freeCodeCamp, and iShelbyBoy.

Planning the Architecture of your Angular App – André Braga – Medium

  • Services/Communication = How is the app going to talk to the server?

I know that building an Angular application is not the same, but I think that the same exact principles apply, just like a blueprint and an architect would have all the information to build a successful building, we also need a specific thing to plan the building of our application. For me all the teams, or each developer, should take time to think about this:
App Overview = What is the application for? App Features = For sure that this depends if you’re using a waterfall or agile approach, but you should know some of the features. Well that’s good to know up front because that’s going to change some of the architecture on how data is exchanged between not only the back end and the front end, but even between services and components in your Angular app. Continue reading

A Deep sight Angular 6 vs React & Co – ITNEXT

Good separation between logic, markup, styles
Close to web components, uses shadow DOM
Supports the awesome async pipe (check this out)

ReactJs: A JSX file, a syntax extension for Javascript, which has both markup and logic inside, with lifecycle methods, and props for data binding. Can use JS inside the markup
All in one, styles, logic, html
At scale complex and fussy structure, no separation of concerns, propTypes, connectors, import of CSS in JS,

On the left and Angular component, on the right a ReactJs componentModules
Angular: Introduces NgModules, couplers, that have components, own routing, are independent from main module, can be reused and shared. This leads (in my opinion) to confusion, allowing the developers the “freedom” to create objects everywhere and replicate code, causing code structure to rot easily unless you really Angular Animation module, which allows to animate almost everything with just code directives(using the component meta tag animation attribute), with great flexibility, abstracting all the boilerplate of css and web animations. This is a big advantage because the packages are kept updated by Angular team, they comes in sync, and a change log is released with deprecations for future updates, they are tested over Google products, bugs are fixed faster than in community projects, and you do not have to worry about libraries incompatibilities. You can find projects where there is not a clear distinction between templates, services, styles, libraries, components (example Powerful to make fine tuning and flexible Angular 6 has great performance in rendering with the new template engine and change detection. Continue reading

The Visual Guide To JavaScript Variable Definitions & Scope

Hints Of The Closure Pattern
Functions enable closure pattern because their variables are hidden from global scope but can still be accessed from other function scopes within them:
The idea is to protect variables from global scope but still be able to call the function from it. When variables are defined in global scope… there is no difference between var, let and const in terms of scope visibility:
They all propagate into inner block-level, function-level and event callback scopes:Keywords let and const limit variable to the scope in which they were defined:
Variables defined using let and const are not hoisted. The closure pattern allows its inner function to modify the variable without direct access to it from Global Scope…
The whole point is that Global Scope does not need to know or understand how the code inside add() works. In classes variables are defined inside its constructor function or its methods and attached to the object via this property:
The this Keyword In Class constructor Function
The this keyword is used to define object properties. Local Variable Definitions
Local variables can be defined using var, let or const keywords, but they will
remain limited to the scope of the constructor or the method in which they were defined, without actually becoming properties of the object. Continue reading


  • This extension is a generic UI for the Angular CLI.

This packages transforms VSCode into the best editor for Angular development. The package adds Angular Language Service and Angular Console to your project's list of recommended plugins. This extension provides a rich editing experience for Angular templates. Angular CLI is a command-line tool, which works great when you want to serve an application or generate a simple component. Continue reading

How to use console in node.js ―

The supported substitution tokens are:


const msg = `Using the console class`;
console.log('%s', msg);
%s is the default substitution pattern. %d, %f, %i, %o

const circle = (radius = 1) = {
const profile = {};
const pi = 22/7;
profile.diameter = 2_pi_radius;
profile.circumference = pi_radius_2;
profile.area = pi_radius^2;
profile.volume = 4/3_pi_radius^3;

console.log('This circle has a radius of: %d cm', radius);
console.log('This circle has a circumference of: %f cm', profile.diameter);
console.log('This circle has an area of: %i cm^2', profile.area);
console.log('The profile of this cirlce is: %o', profile);
console.log('Diameter %d, Area: %f, Circumference %i', profile.diameter, profile.area, is what happens:

%d will be substituted by a digit (integer or float). const authorsAndBooks = [['Tolkien', 'Lord of The Rings'],['Rutger', 'Utopia For Realists'], ['Sinek', 'Leaders Eat Last'], ['Eyal', objects with a depth of 1, the object keys will be listed under the index header and the values in the object under the second column header. We'll build a mini testing framework using console.assert

const sum = (a = 0, b = 0) = Number(a) + Number(b);

function test(functionName, actualFunctionResult, expected) {
const actual = actualFunctionResu
const pass = actual === expected;
console.assert(pass, `Assertion failed for ${functionName}`);
return `Test passed ${actual} === sum(1,1), 2));
console.log(test('sum', sum(), 0));
console.log(test('sum', sum, 2));
console.log(test('sum', sum(3,3), 4));
Run the above in your node REPL or browser console to see what happens. == ${expected}`));
} else {


otherTest(sum(1,1), 3);

This console method will prints the string Trace: followed by the label passed to the function then the stack trace to the current position of the function. Continue reading

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