Try class

An alias for Call effect. It makes try/catch/finally code blocks more readable.

It is useful to catch errors during effect resolve and instruct finally blocks. It is not possible to catch effect resolve errors by standart try/catch blocks. Try effect must be used to handle those errors and finally code blocks.

Example

In the following example, there is a simple checkout saga function. It tries to checkout the cart. If fails it dispatches a CheckoutFailure action.

 import 'package:redux_saga/redux_saga.dart';
 import 'Api.dart';

 //...

 checkout() sync* {
   yield Try(() sync* {
     var cart = Result<Cart>();
     yield Select(selector: getCart, result: cart);
     yield Call(buyProductsAPI, args: [cart.value]);
     yield Put(CheckoutSuccess(cart.value));
   }, Catch: (e, s) sync* {
     yield Put(CheckoutFailure(error));
   });
 }

Inheritance

• Object
• Effect
• EffectWithResult
• Call
• Try

Constructors

Try(Function fn, {List? args, Map<Symbol, dynamic>? namedArgs, Function? Catch, Function? Finally, String? name, Result? result})

Creates an instance of a Try effect.

Properties

args → List?

Arguments of the function to call

final, inherited

Catch → Function?

A Generator function or a normal function to invoke for uncaught errors.

final, inherited

Finally → Function?

A Generator function or a normal function to invoke in any case after call.

final, inherited

fn → Function

A Generator function or a normal function to call.

final, inherited

hashCode → int

The hash code for this object.

no setter, inherited

name → String?

Meta name of function

final, inherited

namedArgs → Map<Symbol, dynamic>?

Named arguments of the function to call

final, inherited

result ↔ Result?

Result after effect is resolved.

getter/setter pair, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

getDefinition() → Map<String, dynamic>

Returns all properties of effect as a dictionary object

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited