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