Rename javascript to js

js/snippets/is-generator-function.md

@@ -0,0 +1,22 @@
+---
+title: Value is generator function
+type: snippet
+tags: [type,function]
+author: chalarangelo
+cover: interior-4
+dateModified: 2020-10-20T11:21:07+03:00
+---
+
+Checks if the given argument is a generator function.
+
+- Use `Object.prototype.toString()` and `Function.prototype.call()` and check if the result is `'[object GeneratorFunction]'`.
+
+```js
+const isGeneratorFunction = val =>
+  Object.prototype.toString.call(val) === '[object GeneratorFunction]';
+```
+
+```js
+isGeneratorFunction(function() {}); // false
+isGeneratorFunction(function*() {}); // true
+```