This article covers features introduced in SpiderMonkey 17
Convert any JavaScript value to a boolean.
bool JS::ToBoolean(JS::HandleValue v)
| Name | Type | Description |
|---|---|---|
v |
JS::HandleValue |
The value to convert. |
JS::ToBoolean converts a JavaScript value to a boolean. It implements the ToBoolean operation described in ECMA 262-3 §9.2. This function can not fail and the return value is always the boolean conversion of the argument.
BOOLEAN_TO_JSVALDOUBLE_TO_JSVALINT_FITS_IN_JSVALINT_TO_JSVALJS::AutoSaveExceptionStateJS::CallJS::CloneFunctionObjectJS::CompileJS::CompileFunctionJS::CompileOffThreadJS::CompileOptionsJS::ConstructJS::CreateErrorJS::CurrentGlobalOrNullJS::EvaluateJS::IsCallableJS::NullHandleValueJS::SourceBufferHolderJS::ToBooleanJS::ToInt32JS::ToInt64JS::ToNumberJS::ToStringJS::ToUint16JS::ToUint32JS::ToUint64JS::TrueHandleValueJS::UndefinedHandleValueJS::ValueJSAutoCompartmentJSBoolJSClassJSClass.callJSClass.checkAccessJSClass.convertJSClass.enumerateJSClass.finalizeJSClass.flagsJSClass.getObjectOpsJSClass.hasInstanceJSClass.markJSClass.reserveSlotsJSClass.resolveJSClass.xdrObjectJSConstDoubleSpecJSEnumerateOpJSErrorFormatStringJSErrorReportJSExceptionStateJSExnTypeJSExtendedClassJSExtendedClass.iteratorObjectJSExtendedClass.outerObjectJSExtendedClass.wrappedObjectJSFUN_BOUND_METHODJSFUN_GLOBAL_PARENTJSFastNativeJSFunctionJSFunctionSpecJSIdArrayJSNativeJSNewResolveOpJSObjectJSObjectOpJSObjectOps.defaultValueJSObjectOps.definePropertyJSObjectOps.destroyObjectMapJSObjectOps.dropPropertyJSObjectOps.enumerateJSObjectOps.getAttributesJSObjectOps.getPropertyJSObjectOps.getRequiredSlotJSObjectOps.lookupPropertyJSObjectOps.newObjectMapJSObjectOps.setProtoJSObjectPrincipalsFinderJSPRINCIPALS_HOLDJSPrincipalsJSPrincipalsTranscoderJSPropertyJSPropertyOpJSPropertySpecJSRuntimeJSSecurityCallbacks.contentSecurityPolicyAllowsJSStringJSTraceOpJSTypeJSVAL_IS_BOOLEANJSVAL_IS_DOUBLEJSVAL_IS_GCTHINGJSVAL_IS_INTJSVAL_IS_NULLJSVAL_IS_NUMBERJSVAL_IS_OBJECTJSVAL_IS_PRIMITIVEJSVAL_IS_STRINGJSVAL_IS_VOIDJSVAL_LOCKJSVAL_NULLJSVAL_ONEJSVAL_TO_BOOLEANJSVAL_TO_DOUBLEJSVAL_TO_GCTHINGJSVAL_TO_INTJSVAL_TO_OBJECTJSVAL_TO_STRINGJSVAL_TRUEJSVAL_UNLOCKJSVAL_VOIDJSVAL_ZEROJSVersionJS_Add*RootJS_AddArgumentFormatterJS_AddExternalStringFinalizerJS_AliasElementJS_AliasPropertyJS_AlreadyHasOwnPropertyJS_BeginRequestJS_BufferIsCompilableUnitJS_CStringsAreUTF8JS_CallFunctionJS_CallFunctionNameJS_CallFunctionValueJS_CheckAccessJS_ClearContextThreadJS_ClearNewbornRootsJS_ClearNonGlobalObjectJS_ClearPendingExceptionJS_ClearScopeJS_CloneFunctionObjectJS_CompareStringsJS_CompileFileHandleForPrincipalsJS_CompileFileHandleForPrincipalsVersionJS_CompileFunctionJS_CompileFunctionForPrincipalsJS_CompileScriptJS_CompileScriptForPrincipalsJS_CompileUCFunctionForPrincipalsVersionJS_CompileUTF8FileJS_CompileUTF8FileHandleJS_ConcatStringsJS_ConstructObjectJS_ContextIteratorJS_ConvertArgumentsJS_ConvertArgumentsVAJS_ConvertValueJS_DecompileFunctionJS_DecompileFunctionBodyJS_DecompileScriptJS_DecompileScriptObjectJS_DeepFreezeObjectJS_DefaultValueJS_DefineConstDoublesJS_DefineElementJS_DefineFunctionJS_DefineFunctionByIdJS_DefineFunctionsJS_DefineObjectJS_DefineOwnPropertyJS_DefinePropertiesJS_DefinePropertyJS_DefinePropertyWithTinyIdJS_DeleteElementJS_DeleteElement2JS_DeletePropertyJS_DeleteProperty2JS_DestroyContextJS_DestroyIdArrayJS_DestroyRuntimeJS_DestroyScriptJS_DoubleIsInt32JS_DoubleToInt32JS_DropExceptionStateJS_DumpHeapJS_DumpNamedRootsJS_EncodeCharactersJS_EnterCompartmentJS_EnterCrossCompartmentCallJS_EnterLocalRootScopeJS_EnumerateJS_EnumerateResolvedStandardClassesJS_EnumerateStandardClassesJS_ErrorFromExceptionJS_EvaluateScriptJS_EvaluateScriptForPrincipalsJS_ExecuteRegExpJS_ExecuteRegExpNoStaticsJS_ExecuteScriptJS_ExecuteScriptPartJS_ExecuteScriptVersionJS_FORGET_STRING_FLATNESSJS_FSJS_FileEscapedStringJS_FinishJS_FlatStringEqualsAsciiJS_FlattenStringJS_FlushCachesJS_ForgetLocalRootJS_FreezeObjectJS_GCJS_GET_CLASSJS_GetArrayLengthJS_GetArrayPrototypeJS_GetClassJS_GetCompartmentPrivateJS_GetConstructorJS_GetContextPrivateJS_GetContextThreadJS_GetElementJS_GetEmptyStringJS_GetEmptyStringValueJS_GetErrorPrototypeJS_GetExternalStringClosureJS_GetFlatStringCharsJS_GetFunctionArityJS_GetFunctionCallbackJS_GetFunctionDisplayIdJS_GetFunctionFlagsJS_GetFunctionIdJS_GetFunctionNameJS_GetFunctionObjectJS_GetFunctionPrototypeJS_GetGCParameterJS_GetGCParameterForThreadJS_GetGlobalForCompartmentOrNullJS_GetGlobalForObjectJS_GetGlobalForObject3JS_GetGlobalForScopeChainJS_GetGlobalObjectJS_GetImplementationVersionJS_GetInstancePrivateJS_GetInternedStringCharsJS_GetInternedStringCharsAndLengthJS_GetLocaleCallbacksJS_GetNaNValueJS_GetObjectPrototypeJS_GetObjectRuntimeJS_GetOptionsJS_GetOwnPropertyDescriptorJS_GetParentJS_GetParentRuntimeJS_GetPendingExceptionJS_GetPositiveInfinityValueJS_GetPrivateJS_GetPropertyJS_GetPropertyAttributesJS_GetPropertyAttrsGetterAndSetterJS_GetPropertyByIdDefaultJS_GetPropertyDefaultJS_GetPropertyDescriptorByIdJS_GetPrototypeJS_GetReservedSlotJS_GetRuntimeJS_GetRuntimePrivateJS_GetScopeChainJS_GetSecurityCallbacksJS_GetStringBytesJS_GetStringCharsJS_GetStringCharsAndLengthJS_GetStringLengthJS_GetTypeNameJS_GetVersionJS_HasArrayLengthJS_HasElementJS_HasInstanceJS_HasPropertyJS_IdToValueJS_InitJS_InitCTypesClassJS_InitClassJS_InitStandardClassesJS_InstanceOfJS_InternJSStringJS_InternStringJS_IsArrayObjectJS_IsAssigningJS_IsConstructingJS_IsConstructing_PossiblyWithGivenThisObjectJS_IsExceptionPendingJS_IsExtensibleJS_IsExternalStringJS_IsRunningJS_IsStopIterationJS_IterateCompartmentsJS_LeaveCompartmentJS_LeaveCrossCompartmentCallJS_LeaveLocalRootScopeJS_LeaveLocalRootScopeWithResultJS_LockJS_LockGCThingJS_LookupElementJS_LookupPropertyJS_LooselyEqualJS_MakeStringImmutableJS_MapGCRootsJS_MaybeGCJS_NewJS_NewArrayObjectJS_NewCompartmentAndGlobalObjectJS_NewContextJS_NewDateObjectJS_NewDateObjectMsecJS_NewDependentStringJS_NewDoubleJS_NewDoubleValueJS_NewExternalStringJS_NewFunctionJS_NewGlobalObjectJS_NewNumberValueJS_NewObjectJS_NewObjectForConstructorJS_NewPropertyIteratorJS_NewRegExpObjectJS_NewRuntimeJS_NewScriptObjectJS_NewStringJS_NewStringCopyNJS_NewStringCopyZJS_NextPropertyJS_NumberValueJS_ObjectIsDateJS_ObjectIsFunctionJS_ParseJSONJS_PopArgumentsJS_PreventExtensionsJS_PropertyStubJS_PushArgumentsJS_Remove*RootJS_RemoveExternalStringFinalizerJS_RemoveRootRTJS_ReportErrorJS_ReportErrorNumberJS_ReportOutOfMemoryJS_ReportPendingExceptionJS_ResolveStandardClassJS_RestoreExceptionStateJS_SET_TRACING_DETAILSJS_SameValueJS_SaveExceptionStateJS_SaveFrameChainJS_SealObjectJS_SetAllNonReservedSlotsToUndefinedJS_SetArrayLengthJS_SetBranchCallbackJS_SetCallReturnValue2JS_SetCheckObjectAccessCallbackJS_SetCompartmentNameCallbackJS_SetContextCallbackJS_SetDefaultLocaleJS_SetDestroyCompartmentCallbackJS_SetElementJS_SetErrorReporterJS_SetExtraGCRootsJS_SetFunctionCallbackJS_SetGCCallbackJS_SetGCZealJS_SetGlobalObjectJS_SetICUMemoryFunctionsJS_SetInterruptCallbackJS_SetNativeStackQuotaJS_SetObjectPrincipalsFinderJS_SetOperationCallbackJS_SetOptionsJS_SetParentJS_SetPendingExceptionJS_SetPrincipalsTranscoderJS_SetPrivateJS_SetPropertyJS_SetPropertyAttributesJS_SetPrototypeJS_SetScriptStackQuotaJS_SetThreadStackLimitJS_SetVersionJS_SetVersionForCompartmentJS_ShutDownJS_StrictlyEqualJS_StringToVersionJS_SuspendRequestJS_THREADSAFEJS_ThrowStopIterationJS_ToggleOptionsJS_TracerInitJS_TypeOfValueJS_UnlockJS_ValueToBooleanJS_ValueToECMAInt32JS_ValueToFunctionJS_ValueToIdJS_ValueToInt32JS_ValueToNumberJS_ValueToObjectJS_ValueToStringJS_VersionToStringJS_YieldRequestJS_mallocOBJECT_TO_JSVALPRIVATE_TO_JSVALSTRING_TO_JSVALStored 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