Basic
print¶
console.log("Hello, World!");
console.error("Something went wrong");
console.warn("Warning");
console.info("Information");
node hello.js
variables¶
const name = "Ashe";
let age = 20;
age = 21;
types¶
const name = "Charles"; // string
const age = 20; // number
const online = true; // boolean
const value = undefined; // undefined
const empty = null; // null
const user = { name: "Charles" }; // object
const numbers = [1, 2, 3]; // array
graph TD
JS[JavaScript Data Types]
JS --> Prim[Primitive Types]
JS --> Obj[Objects / Reference Types]
Prim --> P1[String]
Prim --> P2[Number]
Prim --> P3[BigInt]
Prim --> P4[Boolean]
Prim --> P5[Undefined]
Prim --> P6[Null]
Prim --> P7[Symbol]
Obj --> O1[Standard Object]
Obj --> O2[Array]
Obj --> O3[Function]
Obj --> O4[Built-in Objects]
O4 --> B1[Date]
O4 --> B2[RegExp]
O4 --> B3[Map / Set]
O4 --> B4[Error]
O4 --> B5[Promise]