JSPM – sequence-stepper@0.2.3

Package Exports

sequence-stepper

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Readme

#sequence-stepper

The small lib for the asynchronous control of stack of functions. It can start an execution at any step in a queue till the end.

##Installation

npm install --save sequence-stepper

##Usage

###class Stepper Creation a stepper queue

import {Stepper} from 'stepper';

let stepper = new Stepper([
  (step, data) => step.next(++data),
  (step, data) => data > 2 ? step.next(data * 2) : step.reject('fail'),
  (step, data) => console.log(data)
]);

Start an execution

stepper.next(data);

You can step back with the same code (backward step doesn't execute)

stepper.prev();

Execute a step after stepDescriptor

stepper.next(data, stepper[2]);

Execution on some step in queue

let savedStepDescriptor;

let stepper = new Stepper([
  (step, data) => {...},
  (step, data) => {
    //some behavior
    ...
    savedStepDescriptor = step;
    step.next();
  },
  (step, data) => {...}
]);

stepper.next()//execute queue to the end

savedStepDescriptor.next()//execute queue from saved step to the end;

###function sequence Its help you to make a function thats launches a queue to the end. You can make it with this simple functional conveyors.

import {sequence} from 'Stepper'

let queue = sequence([
  (step, data) => step.next(data * 2),
  (step, data) => step.next(data + 4),
  (step, data) => data * 3,
])

let result = queue(5);//result === 42

You can add an asynchronous behavior into a steps

let queue = sequence([
  (step, data) => setTimeout(() => step.next(data + 11), 100),
  (step, data) => console.log(data * 2),
])

queue(10);//output 42 in console after 100ms