iif.md

iif decorator

The iif decorator allows you to execute given Pipeline.StepFunction conditionally or acts as a pass-through if the provided condition is not satisfied. You can explore the source code here.

Example

1. Provided condition satisfied

Here the manageOnlyStringsPipeline will be executed since the first argument of iif evaluates to true.

const { iif, pipe, step } = require('@axa/bautajs-core')


const stepReturnString = step(() => 'I am so random!');
const stepManagesStrings = step(() => 'I can manage only strings');

const pipeline = pipe(
  stepReturnString,
  iif(prev => typeof prev === 'string', stepManagesStrings)
);

 // => 'I can manage only strings'

2. Provided condition not satisfied without else pipeline

Here iif works as a pass-through, since the first argument will evaluate to false.

const { iif, pipe } = require('@axa/bautajs-core')

const pipeline = pipe(
  () => 'Plastic is not fantastic!',
  iif(
    prev => prev.includes('Plastic is fantastic!'),
    () => 'Plastic is fantastic!'
  )
);

// => 'Plastic is not fantastic!'

3. Provided condition not satisfied with else pipeline

Here the else pipeline will be executed since the first argument of iif evaluates to false.

const { iif, pipe } = require('@axa/bautajs-core')


const pipeline = pipe(
  () => 'Plastic is not fantastic!',
  iif(
    prev => prev.includes('Plastic is fantastic!'),
    () => 'Plastic is fantastic!',
    () => 'Else: Pink plastic partially problematic'
  )
);

// => 'Else: Pink plastic partially problematic!'