staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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messanjah

Dealing with conflicts to db/structure.sql (when merging master)

$ git checkout master

# Change database.yml to point to database: clean (on localhost) in development env

# In one command:
# 1) drops the database specified in database.yml for current env ('clean' database)
# 2) creates a db with name specified in database.yml
# 3) loads master's structure into the database specified in database.yml

ravibhure

In your local clone of your forked repository, you can add the original GitHub repository as a "remote". ("Remotes" are like nicknames for the URLs of repositories - origin is one, for example.) Then you can fetch all the branches from that upstream repository, and rebase your work to continue working on the upstream version. In terms of commands that might look like:

Add the remote, call it "upstream":

git remote add upstream https://github.com/whoever/whatever.git

Fetch all the branches of that remote into remote-tracking branches, such as upstream/master:

git fetch upstream

indiesquidge

Plain JavaScript objects are better than classes when they can be used, and many popular modern frameworks have adopted their use.

Consider that in React a component can be created as either a class or as an object.

// using a class
class Welcome extends React.Component {
  render() {
 Hello, {this.props.name}

Xotabu4

FROM node:7
COPY . /e2e
WORKDIR /e2e
RUN npm install 
CMD npm test

Quramy

Performance of unit testing Angular app

I'm loving Angular, but running unit tests on Karma gets my nerves. It's too slow for me.

In this post, I explain mechanics under Angular's testing module and how to improve the performance.

What makes my tests slow?

To evaluate Angular unit testing performance I captured the CPU profiling with running Karma.

Tuizi

import { Action, ActionReducer, Store } from '@ngrx/store';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operator/map';
import { Observer } from 'rxjs/Observer';

// TODO: How to initialize those variables?
const dispatcherMock: Observer<Action>,
    reducerMock: Observer<ActionReducer<any>>,
    stateMock: Observable<any>;

vsavkin

import { MovieShowingsComponent } from './movie-showings.component';
import { cold, getTestScheduler } from 'jasmine-marbles';

describe('MovieShowingsComponent', () => {
  it('should not have a race condition', () => {
    const backend = jasmine.createSpyObj('backend', ['getShowings']);
    const cmp = new MovieShowingsComponent(backend);

    backend.getShowings.and.returnValue(cold('--x|', {x: ['10am']}));
    cmp.selectMovie('After the Storm');

darvell

If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(`
    [Security.Principal.WindowsBuiltInRole] "Administrator"))
{
    Write-Warning "You do not have Administrator rights to run this script!`nPlease re-run this script as an Administrator!"
    Break
}

Write-Host "Excluding appdata NPM folder and Node.JS install folder from Windows Defender."
Add-MpPreference -ExclusionPath ([System.Environment]::ExpandEnvironmentVariables("%APPDATA%\npm\"))
Add-MpPreference -ExclusionPath (Get-ItemProperty "HKLM:SOFTWARE\Node.js" | Select-Object -Property InstallPath)

tyrcho

We use git-secret to encrypt/decrypt sensitive information like production passwords.

GPG keys

Each developper needs to generate a pair of private/public key.

https://help.github.com/articles/generating-a-new-gpg-key/

gpg --full-generate-key