Rename js snippets

snippets/js/s/flip-function-arguments.md

@@ -0,0 +1,27 @@
+---
+title: Flip function arguments
+type: snippet
+language: javascript
+tags: [function]
+cover: interior-11
+dateModified: 2021-06-13T13:50:25+03:00
+---
+
+Takes a function as an argument, then makes the first argument the last.
+
+- Use argument destructuring and a closure with variadic arguments.
+- Splice the first argument, using the spread operator (`...`), to make it the last before applying the rest.
+
+```js
+const flip = fn => (first, ...rest) => fn(...rest, first);
+```
+
+```js
+let a = { name: 'John Smith' };
+let b = {};
+const mergeFrom = flip(Object.assign);
+let mergePerson = mergeFrom.bind(null, a);
+mergePerson(b); // == b
+b = {};
+Object.assign(b, a); // == b
+```