akasha.core

Class JsObject

java.lang.Object

akasha.core.JsObject

Direct Known Subclasses:

AbortController, AbstractRange, ANGLE_instanced_arrays, AnimationEffect, AnimationTimeline, ArrayBuffer, AudioBuffer, AudioData, AudioDecoder, AudioEncoder, AudioListener, AudioParam, AudioParamMap, AudioTrack, AudioWorkletProcessor, AuthenticatorResponse, BarProp, Blob, BluetoothCharacteristicProperties, BluetoothManufacturerDataMap, BluetoothRemoteGATTDescriptor, BluetoothRemoteGATTServer, BluetoothServiceDataMap, BluetoothUUID, ByteLengthQueuingStrategy, Cache, CacheStorage, CanvasFilter, CanvasGradient, CanvasPattern, CanvasRenderingContext2D, CaretPosition, Client, Clients, ClipboardItem, CompileError, CompressionStream, CountQueuingStrategy, Credential, CredentialsContainer, Crypto, CryptoKey, CSSFontFeatureValuesMap, CSSRule, CSSRuleList, CSSStyleDeclaration, CustomElementRegistry, DataTransfer, DataTransferItem, DataTransferItemList, DataView, DecompressionStream, DeviceMotionEventAcceleration, DeviceMotionEventRotationRate, DOMImplementation, DOMMatrixReadOnly, DOMParser, DOMPointReadOnly, DOMQuad, DOMRectList, DOMRectReadOnly, DOMStringList, DOMStringMap, DOMTokenList, ElementInternals, EncodedAudioChunk, EncodedVideoChunk, Event, EventTarget, EXT_blend_minmax, EXT_color_buffer_float, EXT_color_buffer_half_float, EXT_disjoint_timer_query, EXT_disjoint_timer_query_webgl2, EXT_float_blend, EXT_frag_depth, EXT_shader_texture_lod, EXT_sRGB, EXT_texture_compression_bptc, EXT_texture_compression_rgtc, EXT_texture_filter_anisotropic, EXT_texture_norm16, FileList, FileReaderSync, FileSystemHandle, Float32Array, Float64Array, FormData, Gamepad, GamepadButton, GamepadHapticActuator, GamepadPose, GamepadTouch, Geolocation, GeolocationCoordinates, GeolocationPosition, GeolocationPositionError, Global, GPU, GPUAdapter, GPUBindGroup, GPUBindGroupLayout, GPUBuffer, GPUCanvasContext, GPUCommandBuffer, GPUCommandEncoder, GPUCompilationInfo, GPUCompilationMessage, GPUComputePassEncoder, GPUComputePipeline, GPUDeviceLostInfo, GPUExternalTexture, GPUOutOfMemoryError, GPUPipelineLayout, GPUQuerySet, GPUQueue, GPURenderBundle, GPURenderBundleEncoder, GPURenderPassEncoder, GPURenderPipeline, GPUSampler, GPUShaderModule, GPUSupportedFeatures, GPUSupportedLimits, GPUTexture, GPUTextureView, GPUValidationError, Headers, History, HTMLAllCollection, HTMLCollection, HTMLFormControlsCollection, IDBCursor, IDBFactory, IDBIndex, IDBKeyRange, IDBObjectStore, IdleDeadline, ImageBitmap, ImageBitmapRenderingContext, ImageData, ImageDecoder, ImageTrackList, Instance, Int16Array, Int32Array, Int8Array, IntersectionObserver, IntersectionObserverEntry, JsBoolean, JsDate, JsError, JsNumber, JSON, JsString, KHR_parallel_shader_compile, LinkError, Location, MediaDeviceInfo, MediaError, MediaKeys, MediaKeyStatusMap, MediaKeySystemAccess, MediaList, Memory, MessageChannel, MIDIInputMap, MIDIOutputMap, MimeType, MimeTypeArray, Module, MutationObserver, MutationRecord, NamedNodeMap, NavigationPreloadManager, Navigator, NodeIterator, NodeList, OCULUS_multiview, OES_element_index_uint, OES_fbo_render_mipmap, OES_standard_derivatives, OES_texture_float, OES_texture_float_linear, OES_texture_half_float, OES_texture_half_float_linear, OES_vertex_array_object, OffscreenCanvasRenderingContext2D, OVR_multiview2, Path2D, PerformanceEntry, PerformanceNavigation, PerformanceObserver, PerformanceObserverEntryList, PerformanceTiming, PeriodicWave, Permissions, Plugin, PluginArray, PushManager, PushMessageData, PushSubscription, PushSubscriptionOptions, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, RegExp, RegExpGroups, Report, ReportBody, ReportingObserver, Request, ResizeObservation, ResizeObserver, ResizeObserverEntry, ResizeObserverSize, Response, RTCCertificate, RTCIceCandidate, RTCIdentityAssertion, RTCIdentityProviderRegistrar, RTCRtpReceiver, RTCRtpSender, RTCRtpTransceiver, RTCSessionDescription, RTCStatsReport, RuntimeError, Screen, Selection, SharedArrayBuffer, SpeechGrammar, SpeechGrammarList, SpeechRecognitionAlternative, SpeechRecognitionResult, SpeechRecognitionResultList, SpeechSynthesisVoice, Storage, StorageManager, StyleSheet, StyleSheetList, SubtleCrypto, SVGAngle, SVGAnimatedAngle, SVGAnimatedBoolean, SVGAnimatedEnumeration, SVGAnimatedInteger, SVGAnimatedLength, SVGAnimatedLengthList, SVGAnimatedNumber, SVGAnimatedNumberList, SVGAnimatedPreserveAspectRatio, SVGAnimatedRect, SVGAnimatedString, SVGAnimatedTransformList, SVGLength, SVGLengthList, SVGNumber, SVGNumberList, SVGPointList, SVGPreserveAspectRatio, SVGStringList, SVGTransform, SVGTransformList, SVGUnitTypes, SyncManager, Table, TextDecoder, TextDecoderStream, TextEncoder, TextEncoderStream, TextMetrics, TextTrackCueList, TimeRanges, Touch, TouchList, TransformStream, TransformStreamDefaultController, TreeWalker, Uint16Array, Uint32Array, Uint8Array, Uint8ClampedArray, URL, URLSearchParams, USBAlternateInterface, USBConfiguration, USBDevice, USBEndpoint, USBInterface, USBInTransferResult, USBIsochronousInTransferPacket, USBIsochronousInTransferResult, USBIsochronousOutTransferPacket, USBIsochronousOutTransferResult, USBOutTransferResult, ValidityState, VideoColorSpace, VideoDecoder, VideoEncoder, VideoFrame, VideoPlaybackQuality, VideoTrack, VTTRegion, WakeLock, WEBGL_color_buffer_float, WEBGL_compressed_texture_astc, WEBGL_compressed_texture_etc, WEBGL_compressed_texture_etc1, WEBGL_compressed_texture_pvrtc, WEBGL_compressed_texture_s3tc, WEBGL_compressed_texture_s3tc_srgb, WEBGL_debug_renderer_info, WEBGL_debug_shaders, WEBGL_depth_texture, WEBGL_draw_buffers, WEBGL_lose_context, WEBGL_multi_draw, WebGL2RenderingContext, WebGLActiveInfo, WebGLObject, WebGLRenderingContext, WebGLShaderPrecisionFormat, WebGLUniformLocation, WorkerLocation, WorkerNavigator, Worklet, WorkletGlobalScope, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter, XMLSerializer, XPathEvaluator, XPathExpression, XPathResult, XRAnchor, XRAnchorSet, XRDepthInformation, XRFrame, XRHand, XRHitTestResult, XRHitTestSource, XRInputSource, XRInputSourceArray, XRLightEstimate, XRMediaBinding, XRPose, XRRay, XRRenderState, XRRigidTransform, XRSubImage, XRTransientInputHitTestResult, XRTransientInputHitTestSource, XRView, XRViewport, XRWebGLBinding, XSLTProcessor

@JsType(isNative=true,
        namespace="<global>",
        name="Object")
public class JsObject
extends java.lang.Object

The Object class represents one of JavaScript's data types. It is used to store various keyed collections and more complex entities. Objects can be created using the Object() constructor or the object initializer / literal syntax.

See Also:

Object - MDN, Object - ECMAScript (ECMA-262)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JsObject()

Method Summary

Modifier and Type	Method and Description
static java.lang.Object	assign(java.lang.Object target, java.lang.Object... sources) The Object.assign() method copies all enumerable own properties from one or more source objects to a target object.
static java.lang.Object	create(java.lang.Object proto) The Object.create() method creates a new object, using an existing object as the prototype of the newly created object.
static JsObject	create(java.lang.Object proto, jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor> props) The Object.create() method creates a new object, using an existing object as the prototype of the newly created object.
static void	defineProperties(java.lang.Object obj, jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor> props) The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.
static void	defineProperty(java.lang.Object obj, java.lang.String prop, ObjectPropertyDescriptor descriptor) The static method Object.defineProperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object.
static void	defineProperty(java.lang.Object obj, Symbol prop, ObjectPropertyDescriptor descriptor) The static method Object.defineProperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object.
static JsArray<ObjectPropertyEntry>	entries(java.lang.Object obj) The Object.entries() method returns an array of a given object's own enumerable string-keyed property [key, value] pairs, in the same order as that provided by a for...in loop.
static void	freeze(java.lang.Object obj) The Object.freeze() method freezes an object.
static @JsNonNull JsObject	fromEntries(@JsNonNull JsIterable<ObjectPropertyEntry> iterable) The Object.fromEntries() method transforms a list of key-value pairs into an object.
static ObjectPropertyDescriptor	getOwnPropertyDescriptor(java.lang.Object obj, java.lang.String prop) The Object.getOwnPropertyDescriptor() method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain).
static ObjectPropertyDescriptor	getOwnPropertyDescriptor(java.lang.Object obj, Symbol prop) The Object.getOwnPropertyDescriptor() method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain).
static jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor>	getOwnPropertyDescriptors(java.lang.Object obj) The Object.getOwnPropertyDescriptors() method returns all own property descriptors of a given object.
static JsArray<java.lang.String>	getOwnPropertyNames(java.lang.Object obj) The Object.getOwnPropertyNames() method returns an array of all properties (including non-enumerable properties except for those which use Symbol) found directly in a given object.
static JsArray<Symbol>	getOwnPropertySymbols(java.lang.Object obj) The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.
static JsObject	getPrototypeOf(java.lang.Object obj) The Object.getPrototypeOf() method returns the prototype (i.e.
boolean	hasOwnProperty(@JsNonNull java.lang.String prop) The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).
boolean	hasOwnProperty(@JsNonNull Symbol prop) The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).
static boolean	is(@JsNonNull java.lang.Object value1, @JsNonNull java.lang.Object value2) The Object.is() method determines whether two values are the same value.
static boolean	isExtensible(java.lang.Object obj) The Object.isExtensible() method determines if an object is extensible (whether it can have new properties added to it).
static boolean	isFrozen(java.lang.Object obj) The Object.isFrozen() determines if an object is frozen.
boolean	isPrototypeOf(@JsNonNull JsObject object) The isPrototypeOf() method checks if an object exists in another object's prototype chain.
static boolean	isSealed(java.lang.Object obj) The Object.isSealed() method determines if an object is sealed.
static JsArray<java.lang.String>	keys(java.lang.Object obj) The Object.keys() method returns an array of a given object's own enumerable property names, iterated in the same order that a normal loop would.
static void	preventExtensions(java.lang.Object obj) The Object.preventExtensions() method prevents new properties from ever being added to an object (i.e.
boolean	propertyIsEnumerable(@JsNonNull java.lang.String prop) The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable and is the object's own property.
static void	seal(java.lang.Object obj) The Object.seal() method seals an object, preventing new properties from being added to it and marking all existing properties as non-configurable.
static void	setPrototypeOf(java.lang.Object obj, java.lang.Object prototype) The Object.setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.
@JsNonNull java.lang.String	toString_() The valueOf() method returns the wrapped primitive value of a Number object.
jsinterop.base.Any	valueOf_() The valueOf() method returns the wrapped primitive value of a Number object.
static JsArray<jsinterop.base.Any>	values(java.lang.Object obj) The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a for...in loop.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsObject

protected JsObject()

Method Detail

assign

@JsOverlay
 @Nonnull
public static java.lang.Object assign(@Nonnull
                                                           java.lang.Object target,
                                                           @Nonnull
                                                           java.lang.Object... sources)

The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the target object.

See Also:

Object.assign - MDN, Object.assign - ECMAScript (ECMA-262)

create

@JsOverlay
 @Nonnull
public static JsObject create(@Nullable
                                                   java.lang.Object proto,
                                                   @Nullable
                                                   jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor> props)

The Object.create() method creates a new object, using an existing object as the prototype of the newly created object.

See Also:

Object.create - MDN, Object.create - ECMAScript (ECMA-262)

create

@JsOverlay
 @Nonnull
public static java.lang.Object create(@Nullable
                                                           java.lang.Object proto)

The Object.create() method creates a new object, using an existing object as the prototype of the newly created object.

See Also:

Object.create - MDN, Object.create - ECMAScript (ECMA-262)

defineProperties

@JsOverlay
public static void defineProperties(@Nonnull
                                               java.lang.Object obj,
                                               @Nonnull
                                               jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor> props)

The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.

See Also:

Object.defineProperties - MDN, Object.defineProperties - ECMAScript (ECMA-262)

defineProperty

@JsOverlay
public static void defineProperty(@Nonnull
                                             java.lang.Object obj,
                                             @Nonnull
                                             java.lang.String prop,
                                             @Nonnull
                                             ObjectPropertyDescriptor descriptor)

The static method Object.defineProperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

See Also:

Object.defineProperty - MDN, Object.defineProperty - ECMAScript (ECMA-262)

defineProperty

@JsOverlay
public static void defineProperty(@Nonnull
                                             java.lang.Object obj,
                                             @Nonnull
                                             Symbol prop,
                                             @Nonnull
                                             ObjectPropertyDescriptor descriptor)

The static method Object.defineProperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

See Also:

Object.defineProperty - MDN, Object.defineProperty - ECMAScript (ECMA-262)

entries

@JsOverlay
 @Nonnull
public static JsArray<ObjectPropertyEntry> entries(@Nonnull
                                                                        java.lang.Object obj)

The Object.entries() method returns an array of a given object's own enumerable string-keyed property [key, value] pairs, in the same order as that provided by a for...in loop. (The only important difference is that a for...in loop enumerates properties in the prototype chain as well).

See Also:

Object.entries - MDN, Object.entries - ECMAScript (ECMA-262)

freeze

@JsOverlay
public static void freeze(@Nonnull
                                     java.lang.Object obj)

The Object.freeze() method freezes an object. A frozen object can no longer be changed; freezing an object prevents new properties from being added to it, existing properties from being removed, prevents changing the enumerability, configurability, or writability of existing properties, and prevents the values of existing properties from being changed. In addition, freezing an object also prevents its prototype from being changed. freeze() returns the same object that was passed in.

See Also:

Object.freeze - MDN, Object.freeze - ECMAScript (ECMA-262)

fromEntries

public static @JsNonNull JsObject fromEntries(@JsNonNull JsIterable<ObjectPropertyEntry> iterable)

The Object.fromEntries() method transforms a list of key-value pairs into an object.

See Also:

Object.fromEntries - MDN, Object.fromEntries - ECMAScript (ECMA-262)

getOwnPropertyDescriptor

@JsOverlay
 @Nullable
public static ObjectPropertyDescriptor getOwnPropertyDescriptor(@Nonnull
                                                                                      java.lang.Object obj,
                                                                                      @Nonnull
                                                                                      java.lang.String prop)

The Object.getOwnPropertyDescriptor() method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain). The object returned is mutable but mutating it has no effect on the original property's configuration.

See Also:

Object.getOwnPropertyDescriptor - MDN, Object.getOwnPropertyDescriptor - ECMAScript (ECMA-262)

getOwnPropertyDescriptor

@JsOverlay
 @Nullable
public static ObjectPropertyDescriptor getOwnPropertyDescriptor(@Nonnull
                                                                                      java.lang.Object obj,
                                                                                      @Nonnull
                                                                                      Symbol prop)

The Object.getOwnPropertyDescriptor() method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain). The object returned is mutable but mutating it has no effect on the original property's configuration.

See Also:

Object.getOwnPropertyDescriptor - MDN, Object.getOwnPropertyDescriptor - ECMAScript (ECMA-262)

getOwnPropertyDescriptors

@JsOverlay
 @Nonnull
public static jsinterop.base.JsPropertyMap<ObjectPropertyDescriptor> getOwnPropertyDescriptors(@Nonnull
                                                                                                                    java.lang.Object obj)

The Object.getOwnPropertyDescriptors() method returns all own property descriptors of a given object.

See Also:

Object.getOwnPropertyDescriptors - MDN, Object.getOwnPropertyDescriptors - ECMAScript (ECMA-262)

getOwnPropertyNames

@JsOverlay
 @Nonnull
public static JsArray<java.lang.String> getOwnPropertyNames(@Nonnull
                                                                                 java.lang.Object obj)

The Object.getOwnPropertyNames() method returns an array of all properties (including non-enumerable properties except for those which use Symbol) found directly in a given object.

See Also:

Object.getOwnPropertyNames - MDN, Object.getOwnPropertyNames - ECMAScript (ECMA-262)

getOwnPropertySymbols

@JsOverlay
 @Nonnull
public static JsArray<Symbol> getOwnPropertySymbols(@Nonnull
                                                                         java.lang.Object obj)

The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.

See Also:

Object.getOwnPropertySymbols - MDN, Object.getOwnPropertySymbols - ECMAScript (ECMA-262)

getPrototypeOf

@JsOverlay
 @Nullable
public static JsObject getPrototypeOf(@Nonnull
                                                            java.lang.Object obj)

The Object.getPrototypeOf() method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

See Also:

Object.getPrototypeOf - MDN, Object.getPrototypeOf - ECMAScript (ECMA-262)

is

public static boolean is(@JsNonNull java.lang.Object value1,
                         @JsNonNull java.lang.Object value2)

The Object.is() method determines whether two values are the same value.

See Also:

Object.is - MDN, Object.is - ECMAScript (ECMA-262)

isExtensible

@JsOverlay
public static boolean isExtensible(@Nonnull
                                              java.lang.Object obj)

The Object.isExtensible() method determines if an object is extensible (whether it can have new properties added to it).

See Also:

Object.isExtensible - MDN, Object.isExtensible - ECMAScript (ECMA-262)

isFrozen

@JsOverlay
public static boolean isFrozen(@Nonnull
                                          java.lang.Object obj)

The Object.isFrozen() determines if an object is frozen.

See Also:

Object.isFrozen - MDN, Object.isFrozen - ECMAScript (ECMA-262)

isSealed

@JsOverlay
public static boolean isSealed(@Nonnull
                                          java.lang.Object obj)

The Object.isSealed() method determines if an object is sealed.

See Also:

Object.isSealed - MDN, Object.isSealed - ECMAScript (ECMA-262)

keys

@JsOverlay
 @Nonnull
public static JsArray<java.lang.String> keys(@Nonnull
                                                                  java.lang.Object obj)

The Object.keys() method returns an array of a given object's own enumerable property names, iterated in the same order that a normal loop would.

See Also:

Object.keys - MDN, Object.keys - ECMAScript (ECMA-262)

preventExtensions

@JsOverlay
public static void preventExtensions(@Nonnull
                                                java.lang.Object obj)

The Object.preventExtensions() method prevents new properties from ever being added to an object (i.e. prevents future extensions to the object).

See Also:

Object.preventExtensions - MDN, Object.preventExtensions - ECMAScript (ECMA-262)

seal

@JsOverlay
public static void seal(@Nonnull
                                   java.lang.Object obj)

The Object.seal() method seals an object, preventing new properties from being added to it and marking all existing properties as non-configurable. Values of present properties can still be changed as long as they are writable.

See Also:

Object.seal - MDN, Object.seal - ECMAScript (ECMA-262)

setPrototypeOf

@JsOverlay
public static void setPrototypeOf(@Nonnull
                                             java.lang.Object obj,
                                             @Nonnull
                                             java.lang.Object prototype)

The Object.setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.

See Also:

Object.setPrototypeOf - MDN, Object.setPrototypeOf - ECMAScript (ECMA-262)

values

@JsOverlay
 @Nonnull
public static JsArray<jsinterop.base.Any> values(@Nonnull
                                                                      java.lang.Object obj)

The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a for...in loop. (The only difference is that a for...in loop enumerates properties in the prototype chain as well.)

See Also:

Object.values - MDN, Object.values - ECMAScript (ECMA-262)

hasOwnProperty

public boolean hasOwnProperty(@JsNonNull Symbol prop)

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

See Also:

Object.prototype.hasOwnProperty - MDN, Object.prototype.hasOwnProperty - ECMAScript (ECMA-262)

hasOwnProperty

public boolean hasOwnProperty(@JsNonNull java.lang.String prop)

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

See Also:

Object.prototype.hasOwnProperty - MDN, Object.prototype.hasOwnProperty - ECMAScript (ECMA-262)

propertyIsEnumerable

public boolean propertyIsEnumerable(@JsNonNull java.lang.String prop)

The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable and is the object's own property.

See Also:

Object.prototype.propertyIsEnumerable - MDN, Object.prototype.propertyIsEnumerable - ECMAScript (ECMA-262)

isPrototypeOf

public boolean isPrototypeOf(@JsNonNull JsObject object)

The isPrototypeOf() method checks if an object exists in another object's prototype chain.

See Also:

Object.prototype.isPrototypeOf - MDN, Object.prototype.isPrototypeOf - ECMAScript (ECMA-262)

valueOf_

@JsMethod(name="valueOf")
public jsinterop.base.Any valueOf_()

The valueOf() method returns the wrapped primitive value of a Number object.

See Also:

Object.prototype.valueOf - MDN, Object.prototype.valueOf - ECMAScript (ECMA-262)

toString_

@JsMethod(name="toString")
public @JsNonNull java.lang.String toString_()

The valueOf() method returns the wrapped primitive value of a Number object.

See Also:

Object.prototype.toString - MDN, Object.prototype.toString - ECMAScript (ECMA-262)