# util.types > `util.types` provides type checks for different kinds of built-in objects. Unlike `instanceof` or `Object.prototype.toString.call(value)`, these checks do not inspect properties of the object that are accessible from JavaScript (like their prototype), and usually have the overhead of calling into C++. The result generally does not make any guarantees about what kinds of properties or behavior a value exposes in JavaScript. They are primarily useful for addon developers who prefer to do type checking in JavaScript. - Source: https://titaniumsdk.com/docs/sdk/12.8.0/util.types - Titanium SDK version: 12.8.0 - Kind: pseudo - Platforms: Android, iPhone, iPad, macOS - Since: Titanium SDK 8.1.0 ## Methods ### isAnyArrayBuffer - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `ArrayBuffer` or `SharedArrayBuffer` instance. See also `util.types.isArrayBuffer()` and `util.types.isSharedArrayBuffer()`. Parameters: - `value` (any): value to check Returns: Boolean ### isArgumentsObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an `arguments` object. Parameters: - `value` (any): value to check Returns: Boolean ### isArrayBuffer - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `ArrayBuffer` instance. This does not include `SharedArrayBuffer` instances. Usually, it is desirable to test for both; See `util.types.isAnyArrayBuffer()` for that. Parameters: - `value` (any): value to check Returns: Boolean ### isArrayBufferView - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an instance of one of the `ArrayBuffer` views, such as typed array objects or `DataView`. Equivalent to `ArrayBuffer.isView()`. Parameters: - `value` (any): value to check Returns: Boolean ### isAsyncFunction - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an `async` function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used. Parameters: - `value` (any): value to check Returns: Boolean ### isBigInt64Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a `Bigint64Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isBigUint64Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a `BigUint64Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isBooleanObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a boolean object, e.g. created by `new Boolean()`. Parameters: - `value` (any): value to check Returns: Boolean ### isBoxedPrimitive - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is any boxed primitive object, e.g. created by `new Boolean()`, `new String()` or `Object(Symbol())`. Parameters: - `value` (any): value to check Returns: Boolean ### isDataView - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `DataView` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isDate - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Date` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isFloat32Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Float32Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isFloat64Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Float64Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isGeneratorFunction - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a generator function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used. Parameters: - `value` (any): value to check Returns: Boolean ### isGeneratorObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a generator object as returned from a built-in generator function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used. Parameters: - `value` (any): value to check Returns: Boolean ### isInt16Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Int16Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isInt32Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Int32Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isInt8Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Int8Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isMap - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Map` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isMapIterator - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an iterator returned for a built-in `Map` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isNativeError - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an instance of a built-in `Error` type. Parameters: - `value` (any): value to check Returns: Boolean ### isNumberObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a number object, e.g. created by `new Number()`. Parameters: - `value` (any): value to check Returns: Boolean ### isPromise - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Promise`. Parameters: - `value` (any): value to check Returns: Boolean ### isRegExp - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a regular expression object. Parameters: - `value` (any): value to check Returns: Boolean ### isSet - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Set` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isSetIterator - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is an iterator returned for a built-in `Set` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isSharedArrayBuffer - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `SharedArrayBuffer` instance. This does not include `ArrayBuffer` instances. Usually, it is desirable to test for both; See `util.types.isAnyArrayBuffer()` for that. Parameters: - `value` (any): value to check Returns: Boolean ### isStringObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a string object, e.g. created by new `String()`. Parameters: - `value` (any): value to check Returns: Boolean ### isSymbolObject - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a symbol object, created by calling `Object()` on a `Symbol` primitive. Parameters: - `value` (any): value to check Returns: Boolean ### isTypedArray - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `TypedArray` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isUint16Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Uint16Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isUint32Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Uint32Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isUint8Array - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Uint8Array` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isUint8ClampedArray - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `Uint8ClampedArray` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isWeakMap - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `WeakMap` instance. Parameters: - `value` (any): value to check Returns: Boolean ### isWeakSet - Platforms: Android, iPhone, iPad, macOS Returns `true` if the `value` is a built-in `WeakSet` instance. Parameters: - `value` (any): value to check Returns: Boolean --- - This corpus documents Titanium SDK 13.4.1. Anything here that does not name a version describes 13.4.1. - Titanium is maintained by TiDev. The Appcelerator toolchain is retired: there is no `appc` CLI, no Appcelerator Studio and no hosted build service. The supported CLI is `titanium` on npm, invoked as `ti`.