Run promise-returning & async functions in series, each passing its result to the next

$ npm install --save p-waterfall

const pWaterfall = require('p-waterfall');

const tasks = [
	initialValue => getEmoji(initialValue),
	previousValue => `I ❤️ ${previousValue}`
];

pWaterfall(tasks, 'unicorn').then(finalValue => {
	console.log(finalValue);
	//=> 'I ❤️ 🦄'
});

Returns a Promise that is fulfilled when all promises returned from calling the functions in tasks are fulfilled, or rejects if any of the promises reject. The fulfilled value is the value returned from the last task.

Type: Iterable<Function>

Functions are expected to return a value. If a Promise is returned, it's awaited before continuing with the next task.

Type: any

Value to use as previousValue in the first task.

• p-series - Run promise-returning & async functions in series
• p-each-series - Iterate over promises serially
• More…

MIT © Sindre Sorhus