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javascript/snippets/ary.md

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+---
+title: Function arity
+type: snippet
+tags: [function]
+cover: trippy-chemicals
+dateModified: 2020-10-18T20:24:28+03:00
+---
+
+Creates a function that accepts up to `n` arguments, ignoring any additional arguments.
+
+- Call the provided function, `fn`, with up to `n` arguments, using `Array.prototype.slice()` and the spread operator (`...`).
+
+```js
+const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
+```
+
+```js
+const firstTwoMax = ary(Math.max, 2);
+[[2, 6, 'a'], [6, 4, 8], [10]].map(x => firstTwoMax(...x)); // [6, 6, 10]
+```