@aofl/register-callback

It allows callback functions to be registered and called in series when registerCallbackInstance.next or registerCallbackInstance.error are called.

Api Documentation

Installation

npm i -S @aofl/register-callback

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Usage

import {RegisterCallback} from '@aofl/register-callback';

const rc = new RegisterCallback();

const unsubscribeHello = rc.register(() => console.log('hello'));
const unsubscribeWorld = rc.register(() => console.log('world'), (e) => console.log);

// invoke next
rc.next(); // expected results: hello \n world

// invoke error
rc.error('uh oh'); // expected results: error function of "world" is invoked printing 'uh oh' to console

// unsubscribe a callback
unsubscribeHello();
rc.next(); // expected results: world

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Methods

constructor()

Creates an instance of RegisterCallback.

Arguments

none.

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register(next, error)

When register() is invoked, it adds next and error functions to the callbacks list.

Arguments

Name	Type	Description
next	Function	The next callback function is invoked when registerCallbackInstance.next() is called.
error	Function	The error callback function is invoked when registerCallbackInstance.error() is called.

Return Value

register() returns a function that when invoked unregisters the callbacks.

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next()

When next() is invoked, it calls all functions in callbacks.next list and passes payload to each function.

Arguments

Name	Type	Description
payload	any	This is the payload that is passed to each next callback function.

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error()

When error() is invoked, it calls all functions in callbacks.error list and passes payload to each function.

Arguments

Name	Type	Description
payload	any	This is the payload that is passed to each error callback function.

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