JSObject extension type

A JavaScript Object.

JSObject is the supertype of all JavaScript objects, but not other JS types, like primitives. See https://dart.dev/interop/js-interop for more details on how to use JavaScript interop.

When declaring interop extension types, JSObject is usually the type you will use as the representation type.

on

JSObjectType

Implemented types

JSAny
Object

Implementers

Available extensions

Annotations

@JS('Object')

Constructors

JSObject(): Creates a new empty JavaScript object.
JSObject.fromInteropObject(Object interopObject): Creates a JSObject from an object provided by an earlier interop library.

Properties

hashCode → int: The hash code for this object.
no setterinherited
isDefinedAndNotNull → bool: Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter
isNull → bool: Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension
Whether this value corresponds to JavaScript null.
no setter
isTruthy → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of !!this in JavaScript.
no setter
isUndefined → bool: Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension
Whether this value corresponds to JavaScript undefined.
no setter
isUndefinedOrNull → bool: Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter
not → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of !this in JavaScript.
no setter
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

add(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this + any in JavaScript.
and(JSAny? any) → JSAny?: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this && any in JavaScript.
callMethod<R extends JSAny?>(JSAny method, [JSAny? arg1, JSAny? arg2, JSAny? arg3, JSAny? arg4]) → R: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Calls method on this JSObject with up to four arguments.
callMethodVarArgs<R extends JSAny?>(JSAny method, [List<JSAny?>? arguments]) → R: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Calls method on this JSObject with a variable number of arguments.
dartify() → Object?: Available on JSAny?, provided by the JSAnyUtilityExtension extension
Converts a JavaScript JSON-like value to the Dart equivalent if possible.
delete(JSAny property) → JSBoolean: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Deletes the property with key property from this JSObject.
divide(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this / any in JavaScript.
equals(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this == any in JavaScript.
exponentiate(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this ** any in JavaScript.
getProperty<R extends JSAny?>(JSAny property) → R: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
The value of the property key property of this JSObject.
greaterThan(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this > any in JavaScript.
greaterThanOrEqualTo(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this >= any in JavaScript.
has(String property) → bool: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Shorthand helper for hasProperty to check whether this JSObject contains the property key property, but takes and returns a Dart value.
hasProperty(JSAny property) → JSBoolean: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Whether or not this JSObject contains the property key property.
instanceof(JSFunction<Function> constructor) → bool: Available on JSAny?, provided by the JSAnyUtilityExtension extension
Whether this JSAny? is an instanceof constructor.
instanceOfString(String constructorName) → bool: Available on JSAny?, provided by the JSAnyUtilityExtension extension
Whether this JSAny? is an instanceof the constructor that is defined by constructorName, which is looked up in the globalContext.
lessThan(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this < any in JavaScript.
lessThanOrEqualTo(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this <= any in JavaScript.
modulo(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this % any in JavaScript.
multiply(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this * any in JavaScript.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
notEquals(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this != any in JavaScript.
or(JSAny? any) → JSAny?: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this || any in JavaScript.
setProperty(JSAny property, JSAny? value) → void: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Write the value of property key property of this JSObject.
strictEquals(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this === any in JavaScript.
strictNotEquals(JSAny? any) → JSBoolean: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this !== any in JavaScript.
subtract(JSAny? any) → JSAny: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this - any in JavaScript.
toString() → String: A string representation of this object.
inherited
typeofEquals(String typeString) → bool: Available on JSAny?, provided by the JSAnyUtilityExtension extension
Whether the result of typeof on this JSAny? is typeString.
unsignedRightShift(JSAny? any) → JSNumber: Available on JSAny?, provided by the JSAnyOperatorExtension extension
The result of this >>> any in JavaScript.

Operators

operator ==(Object other) → bool: The equality operator.
inherited
operator [](String property) → JSAny?: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Shorthand helper for getProperty to get the value of the property key property of this JSObject, but takes a Dart value.
operator []=(String property, JSAny? value) → void: Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension
Shorthand helper for setProperty to write the value of the property key property of this JSObject, but takes a Dart value.

Static Methods

getPrototypeOf(JSAny value) → JSObject?: The JavaScript prototype of the JavaScript value, if any.