Om4ar

Convert an m4a file to an mp3 using ffmpeg

• Install ffmpeg using homebrew:

brew install ffmpeg

• convert the file:

Om4ar

// array , property string
// https://medium.com/javascript-inside/safely-accessing-deeply-nested-values-in-javascript-99bf72a0855a
const get = (p, o) =>
  p.reduce((xs, x) => (xs && xs[x]) ? xs[x] : null, o)
// let's pass in our props object...
console.log(get(['user', 'posts', 0, 'comments'], props))
// [ 'Good one!', 'Interesting...' ]
console.log(get(['user', 'post', 0, 'comments'], props))
// null

Om4ar

import React from "react";
import PropTypes from "prop-types";
import Chip from "material-ui/Chip";
import { withStyles } from "material-ui/styles";

const styles = theme => ({
  root: {
    display: "flex",
    flexWrap: "wrap"
  },

Om4ar

import React from "react";
import PropTypes from "prop-types";
import Chip from "material-ui/Chip";
import { withStyles } from "material-ui/styles";

const styles = theme => ({
  root: {
    display: "flex",
    flexWrap: "wrap"
  },

Om4ar

class ImageUpload extends Component {
  constructor(props) {
    super(props);
    this.state = {
      file: '',
      imagePreviewUrl: ''
    };
    this._handleImageChange = this._handleImageChange.bind(this);
    this._handleSubmit = this._handleSubmit.bind(this);
  }

Om4ar

<?php
// tried this today, 31 May 2011

echo "\n";
echo date('Y-m-d', strtotime('first day of next month'));  // correct

echo "\n";
echo date('Y-m-d', strtotime('+1 month')); // wrong! output is 2011-07-01

echo "\n";

Om4ar

[Unit]
Description=MongoDB Database Service
Wants=network.target
After=network.target

[Service]
Type=simple
PermissionsStartOnly=true
ExecStartPre=/bin/mkdir -p /var/lib/mongodb
ExecStartPre=/bin/chown mongodb:mongodb /var/lib/mongodb

Om4ar

[Unit]
Description=MongoDB Database Service
Wants=network.target
After=network.target

[Service]
Type=forking
PIDFile=/var/run/mongodb/mongod.pid
ExecStart=/usr/local/bin/mongod --config /etc/mongod.conf
ExecReload=/bin/kill -HUP $MAINPID

Om4ar

Immutable Update Cheat Sheet / Receipes
Objects
Updating object property
// Alternative #1
return {...originalObject, existingPropertyKey: newValue };
// Alternative #2
return Object.assign({}, originalObject, { existingPropertyKey: newValue }); // Notice extra { } around properties
Updating nested object property
For nested fields you need to remember to copy every level, read more here.

Om4ar

function post_to_url($url, $data) {
   $fields = '';
   foreach($data as $key => $value) { 
      $fields .= $key . '=' . $value . '&'; 
   }
   rtrim($fields, '&');

   $post = curl_init();

   curl_setopt($post, CURLOPT_URL, $url);