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javascript/snippets/rearg.md

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+---
+title: Rearrange function arguments
+type: snippet
+tags: [function]
+cover: island-corridor
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Creates a function that invokes the provided function with its arguments arranged according to the specified indexes.
+
+- Use `Array.prototype.map()` to reorder arguments based on `indexes`.
+- Use the spread operator (`...`) to pass the transformed arguments to `fn`.
+
+```js
+const rearg = (fn, indexes) => (...args) => fn(...indexes.map(i => args[i]));
+```
+
+```js
+var rearged = rearg(
+  function(a, b, c) {
+    return [a, b, c];
+  },
+  [2, 0, 1]
+);
+rearged('b', 'c', 'a'); // ['a', 'b', 'c']
+```