promise-all-step

PromiseAllStep(coll, iteratee, step, thisArg) ⇒ Promise

Applies the function iteratee to each item in coll after a timeout, which's increased by a step.

Returns: Promise - Like the result of Promise.all()

Param	Type	Description
coll	array	A collection to iterate over
iteratee	function	An async function to apply to each item in coll. Apply with (thisArg, item, index)
step	number	Amount of ms that timeout increases after each item
thisArg	object	The iteratee context

Example

let words = ['Promise', 'all', 'step'];

PromiseAllStep(words, async (word, index) => {
  let uppercase_word = word.toUpperCase();
  console.log(`${word} => ${uppercase_word}`);
  return uppercase_word;
}, 1000)
.then(uppercase_words => console.log('All upper case words : ', uppercase_words.join(', ')))
.catch(err => console.log(err));

// Will print : 
Promise => PROMISE                         // at 0ms
all => ALL                                 // at 1000ms
step => STEP                               // at 2000ms
All upper case words :  PROMISE, ALL, STEP // at 2000ms