In this video, I cover the "let" keyword in ES6 JavaScript. I discuss the differences between "let" and "var" (block scope vs. functional scope). Video on "const": https://youtu.be/2iLVFyYwyRA Support this channel on Patreon: https://patreon.com/codingtrain To buy Coding Train merchandise: https://codingtrain.storenvy.com To Support the Processing Foundation: https://processingfoundation.org/support Send me your questions and coding challenges!: https://github.com/CodingTrain/Rainbow-Topics Contact: Twitter: https://twitter.com/shiffman The Coding Train website: http://thecodingtrain.com/ Source Code for the all Video Lessons: https://github.com/CodingTrain/Rainbow-Code p5.js: https://p5js.org/ Processing: https://processing.org For an Intro to Programming using p5.js: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6Zy51Q-x9tMWIv9cueOFTFA For Coding Challenges: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH Help us caption & translate this video! https://amara.org/v/dXl2/