ps aux | To show processes running

kill -9 processId | processId being the number of the process you want to kill

Node.js fs and querystring | Link and Link

Triangle exercise from Eloquent JavaScript

/* Triangle Exercise from Eloquent JavaScript 28/12/2017 (http://eloquentjavascript.net/02_program_structure.html#h_umoXp9u0e7) */
function drawTriangle(limit, char) {
    var string = '';
    for (var i = 1; i < limit; i++) {
        for (var j = 0; j < i; j++){ // var j = i; j < limit; j++ for inverted triangle
            string += char;
        }
        string += '\n'
        //string += '!';
    }
    console.log(string);
}

drawTriangle(8, '#');

JS Types: String, Boolean, undefined, null, Object, Number, Symbol

AST = abstract syntax tree | AST Explorer

Hold CMD while hovering on a symbol in VS Code and it will display an overlay of the definition. CMD + Click will open the file at the definition.

CMD + D to select next occurrence of a word in VS Code. Shift + CMD + F is find and replace.

Right click "Rename symbol" or FN + F2 shortcut rename symbol

yarn global add typescript

yarn init -y | -y flag is to answer yes to all init options

yarn add -D typescript webpack webpack-dev-server

tsc --init | Creates a ts project for you in the folder

tsc -w | Runs tsc in watch mode

Union types and type alias

// Specify type alias with union types # or $
type ValidSymbols = '#' | '$'
const symbol = '#'