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docs(concatSeries): add @example #2112

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21 changes: 21 additions & 0 deletions lib/concatSeries.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,27 @@ import awaitify from './internal/awaitify.js'
* containing the concatenated results of the `iteratee` function. Invoked with
* (err, results).
* @returns A Promise, if no callback is passed
* @example
*
* // One item at a time. Iteratee arrays are concatenated, in input order.
* const words = ["hello", "world", "async"];
*
* function chars(word, callback) {
* setTimeout(() => {
* callback(null, [...word]);
* }, 100);
* }
*
* async.concatSeries(words, chars, (err, results) => {
* if (err) throw err;
* console.log(results);
* // ["h","e","l","l","o","w","o","r","l","d","a","s","y"]
* });
*
* // Omit the callback and concatSeries returns a Promise.
* const results = await async.concatSeries(words, async (word) => [...word]);
* console.log(results);
* // ["h","e","l","l","o","w","o","r","l","d","a","s","y"]
*/
function concatSeries(coll, iteratee, callback) {
return concatLimit(coll, 1, iteratee, callback)
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