TypeTags .Undefined
Overview
The global undefined property represents the primitive value undefined. It is one of JavaScript's primitive types.
Usage
import { TypeTags } from 'typetags'
function test(t) { if (t === undefined) { return TypeTags.Undefined } return t}
let something
console.log(test(something))// → [object Undefined]Metadata (TType)
| Metadata | Value |
|---|---|
.type | undefined |
.tag | undefined |
.builtin() | undefined |
.getTag() | undefined |
.hasSpecialArgs() | undefined |
.instance() | undefined |
.instanceTypeOf() | undefined |
.info() | see more |
.isAvailable() | false |
.isConstructor() | undefined |
.isFactory() | undefined |
.isFunction() | undefined |
.isGlobal() | undefined |
.isIterator() | undefined |
.isNested() | undefined |
.isObject() | undefined |
.isPrimitive() | undefined |
.isStringifiable() | undefined |
.isSyntatic() | undefined |
.isTypedArray() | undefined |
.ownKeys() | [undefined] |
.toString() | function toString() { [native code] } |
.typeOf() | undefined |
Signature
declare type ITypeTags = { [key in Types | NestedTypes]: Tags}
declare interface Predicate { predicate(value: any): boolean}