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If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:

• We define variables with let and const statements. For the purposes of the React documentation, you can consider them equivalent to var.
• We use the class keyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value of this in a method [depends on how it is called](https://developer.mozilla.org/en-US/docs/Web/Jav

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ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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This is my personal list of functions that I wrote for converting mov files to mp4!

Command Flags

Flag	Options	Description
-codec:a	libfaac, libfdk_aac, libvorbis	Audio Codec
-quality	best, good, realtime	Video Quality
-b:a	128k, 192k, 256k, 320k	Audio Bitrate
-codec:v	mpeg4, libx264, libvpx-vp9	Video Codec

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import path from 'path';
const getMediaType = (mediaUrl) => {
    const clipExt = path.extname(mediaUrl);
    let tmpMediaType = 'video';
    if (clipExt === '.wav' || clipExt === '.mp3' || clipExt === '.m4a' || clipExt === '.flac' || clipExt === '.aiff') {
      tmpMediaType = 'audio';
    }
    return tmpMediaType;
  };

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/**
 * Helper functions to serialize and de-serialize array of words into a tsv string
  example words list
  ```
  [
    {
      "id": 0,
      "start": 1.4,
      "end": 3.9,
      "text": "Can"

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adding prettier linting to your project

Originally from slatejs-transcript-editor/PR#3 by @jamesdools

install dependencies

npm install -save-dev husky prettier pretty-quick

package.json

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Pluck Unique Values from Array of Javascript Objects

Implementation

const pluck = key => array => Array.from(new Set(array.map(obj => obj[key])));

Usage

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/*  
* CSS Responsive media queries
*/

/*  
* Extra large devices 
* large laptops and desktops, 1200px and up
*/
/* @media (min-width: 1200px) {

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To checkout a PR from another repo. Eg you fork a repo you don’t own, or are not a member of. Someone else makes a PR to the original repo and you want to evaluate it locally in your fork.

Add a remote upstream repository

git remote add UPSTREAM git@github.com/USERNAME:REPONAME

Check that it has been added - optional

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// Chris Baume BBC R&D heuristic to estimate duration of a word, based on looking across a number of transcripts.
// from https://github.com/chrisbaume/webaligner/blob/9458df57d854e9df64a54bc23a7f0856de49730f/webaligner.js#L7
// estimates the duration of a word, in seconds

function wordDuration(word) {
    return 0.08475 + (0.05379 * word.length);
}