Primitives

Built in data types in Javascript.

Number#

let a = 1;
let b = 1.23456;
let c = a + b; //c = 2.23456

Boolean#

let a = true;
let b = false;
let c = !b && a; //c = true

String#

let a = "Cruft";
let b = "Engine";
let c = a + b; // c = "CruftEngine"

Object#

let a = { 
    Cruft : true, 
    Engine :false 
}

Array#

let a = [ 1, 2, 3];
    a[0] = 2; //0th element of a is now 2

Function#

let add = (a, b) => {
    return a + b;
}
let c = add(6, 6);

Float32Array#

let a = new Float32Array(9);