2 snippets across 2 stacks - JavaScript, TypeScript
const sym = Symbol(description);const STATUS = Symbol("status");
const order = { [STATUS]: "shipped", id: 101 };
console.log(order[STATUS]); // "shipped"
console.log(Object.keys(order)); // ["id"]Note Symbols are unique and hidden from normal enumeration. Use Symbol.for("key") to create shared/global symbols across modules.
let varName: symbol = Symbol(description);
let varName: bigint = valueBigInt;const uniqueKey: unique symbol = Symbol("cacheKey");
let regularSym: symbol = Symbol("temp");
let hugeNumber: bigint = 9007199254740993n;
let anotherBig: bigint = BigInt("123456789012345678");// unique symbol creates a distinct type; bigint handles arbitrarily large integersNote unique symbol can only be used with const declarations and creates a specific subtype of symbol. bigint cannot be mixed with number in arithmetic - you must explicitly convert. bigint requires target ES2020 or later in tsconfig.