Task
Task
A Task makes it easy to model asynchronous operations that may fail, such as HTTP requests or reading/writing to files/databases.
Task(f)
Task constructor.
| Param | Type | Description |
|---|---|---|
| f | function |
A function that takes two arguments: reject and resolve, which are functions. The function f normally initiates an asynchronous task or one that has side effects, and once it completes, it either calls the resolve function to resolve the task or rejects it. |
Task.of(v)
Task constructor that creates a Task which immediately resolves.
| Param | Type | Description |
|---|---|---|
| v | any |
The value that is passed to the resolve function |
Task.rejected(v)
Task constructor that creates a Task which immediately gets rejected.
| Param | Type | Description |
|---|---|---|
| v | any |
The value that is passed to the rejected function |
Task.fork(reject, resolve)
Executes the Task.
| Param | Type | Description |
|---|---|---|
| reject | function |
Function to be called when the Task is rejected |
| resolve | function |
Function to be called when the Task is resolved |
Task.toString()
Gets a stringified version of the Task.
Task.map(f)
Applies the function f to the value of a successfully resolved Task.
| Param | Type | Description |
|---|---|---|
| f | function |
Function |
Task.getValue()
Gets the function within the Task.
Task.ap(t)
Applies the successful value of the Task t to the successful value (a function) of the current Task.
| Param | Type | Description |
|---|---|---|
| t | Task |
Task with a function as the second element |
Task.concat(t)
Concatenates the current Task with the passed one and returns a new Task. When resolved, it will return the successful result of both tasks.
| Param | Type | Description |
|---|---|---|
| t | Task |
Task to concatenate |
Task.chain(f)
Chains together many computations that return a Task.
| Param | Type | Description |
|---|---|---|
| f | function |
Function that returns another Task |
Task.toPromise()
Converts the current Task to a Promise.