Rename js snippets

snippets/js/s/convert-function-to-variadic.md

@@ -0,0 +1,24 @@
+---
+title: Convert function to variadic
+type: snippet
+language: javascript
+tags: [function,array]
+cover: polar-bear
+dateModified: 2021-06-13T13:50:25+03:00
+---
+
+Changes a function that accepts an array into a variadic function.
+
+- Given a function, return a closure that collects all inputs into an array-accepting function.
+
+```js
+const collectInto = fn => (...args) => fn(args);
+```
+
+```js
+const Pall = collectInto(Promise.all.bind(Promise));
+let p1 = Promise.resolve(1);
+let p2 = Promise.resolve(2);
+let p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));
+Pall(p1, p2, p3).then(console.log); // [1, 2, 3] (after about 2 seconds)
+```