psenger

/**
 * box - turns a value into an array, is nill returns [].     
 * @param {*} value - some value.
 * @return {*[]}
 */
const box = value => {
  // already boxed...
  if ( Array.isArray(value) ) {
    return value;
  }

psenger

const OpaqueWrapper = ({ children }) => (
    children && (
        <Wrapper>
            {React.Children.map(children, child => (
                React.cloneElement(child, {style: {...child.props.style, opacity: 0.5}})
            ))}
        </Wrapper>
    )
);

psenger

How to Undo Mistakes in Git - CLI / Git-Tower

Based on the youtube video How to Undo Mistakes in Git

As a rule of thumb, each commit should have only ONE topic.

How to View Differences

$ git diff 

psenger

1. Create your project online
2. Change directory cd into the project folder locally, and initialize it git init
3. Add all the files git add *
4. Commit all the files to the local git git commit -m "My initial commit"
5. Add the remote git remote add origin git@bitbucket.org:[user]/[my-repo].git
6. Push the files git push -u origin master

psenger

How to find the total size of certain files within a directory

find ./photos/john_doe -type f -name '*.jpg' -exec du -ch {} + | grep total$

Using find with time resrictions

psenger

$ # --------------
$ # How to read a .env file into the current shell, as environment variables.
$ # --------------
$ export  $(egrep -v '^#' .env | xargs)

psenger

/**
 * if you have to support older versions of Express, here is an 
 * example of working with Async / Await in the controller ( old school ).
 **/
const actionController = function actionController(req, res, next) {
  // build async IIFE, returning it.  
  return (async function asyncActionController() {
    try {
      // await for a promise, etc.
      return res.status(201).json({msg:'hello'});

psenger

const Promise = require('bluebird');

// Just for the record, you should avoid this pattern.
// ---------------------------------------------------
//  1.) it is hard to understand
//  2.) It uses nested promises, which is an anti pattern.
//
(async () => {
    return Promise.resolve()
        .then(()=>{

psenger

#!/usr/bin/env node

/** 
 * get the CLI arguments
 **/
const [ , , ...args] = process.argv;

console.log(`args=${args}`);

require( 'fs' ).writeFileSync( `${path.join(__dirname,path.basename(__filename,'.js'))}.pid`, process.pid.toString(), { encoding: 'utf-8' } )

psenger

/**
 * Clean a String of invalid characters - remove all ASCII chars outside of 0-127
 **/
const cleanString = (input) => {
    let output = "";
    for (let i=0; i<input.length; i++) {
        if (input.charCodeAt(i) <= 127) {
            output += input.charAt(i);
        }
    }