types.isBoxedPrimitive - util - Node

function types.isBoxedPrimitive

Usage in Deno

import { types } from "node:util";



isBoxedPrimitive(object: unknown): object is String
 | Number
 | BigInt
 | Boolean
 | Symbol

Returns true if the value is any boxed primitive object, e.g. created by new Boolean(), new String() or Object(Symbol()).

For example:

util.types.isBoxedPrimitive(false); // Returns false
util.types.isBoxedPrimitive(new Boolean(false)); // Returns true
util.types.isBoxedPrimitive(Symbol('foo')); // Returns false
util.types.isBoxedPrimitive(Object(Symbol('foo'))); // Returns true
util.types.isBoxedPrimitive(Object(BigInt(5))); // Returns true

Parameters



object: unknown

Return Type

object is String
 | Number
 | BigInt
 | Boolean
 | Symbol