Prepare repository for merge

javascript/snippets/run-promises-in-series.md

@@ -0,0 +1,22 @@
+---
+title: Run promises in series
+type: snippet
+tags: [function,promise]
+cover: sail-away
+dateModified: 2020-10-22T20:24:30+03:00
+---
+
+Runs an array of promises in series.
+
+- Use `Array.prototype.reduce()` to create a promise chain, where each promise returns the next promise when resolved.
+
+```js
+const runPromisesInSeries = ps =>
+  ps.reduce((p, next) => p.then(next), Promise.resolve());
+```
+
+```js
+const delay = d => new Promise(r => setTimeout(r, d));
+runPromisesInSeries([() => delay(1000), () => delay(2000)]);
+// Executes each promise sequentially, taking a total of 3 seconds to complete
+```