The typeof Operator — What It Gets Right and Wrong

jsTypes.js

console.log(typeof "hello");       // "string"
console.log(typeof 42);            // "number"
console.log(typeof true);          // "boolean"
console.log(typeof undefined);     // "undefined"
console.log(typeof Symbol());      // "symbol"
console.log(typeof 42n);           // "bigint"
console.log(typeof function(){});  // "function"

// The two that will catch you off guard
console.log(typeof null);          // "object"  ← 30-year-old bug, never fixed
console.log(typeof []);            // "object"  ← arrays look like objects too