30-seconds-of-code/snippets/isGeneratorFunction.md

title, tags, expertise, firstSeen, lastUpdated

title	tags	expertise	firstSeen	lastUpdated
Value is generator function	type,function	intermediate	2020-08-07T15:40:38+03:00	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]'.

const isGeneratorFunction = val =>
  Object.prototype.toString.call(val) === '[object GeneratorFunction]';

isGeneratorFunction(function() {}); // false
isGeneratorFunction(function*() {}); // true