rijkvanzanten · November 2, 2016 10:28
diff --git a/requiredFunctionParameters.js b/requiredFunctionParameters.js
 const required = function(paramName) {
  throw new Error(`${paramName} is required`);
 };

 const foo = function((param1 = required('param1')), param2) {
  // ...
 };

 foo(); // Error: param1 is required
	const required = function(paramName) {
	throw new Error(`${paramName} is required`);
	};

	const foo = function((param1 = required('param1')), param2) {
	// ...
	};

	foo(); // Error: param1 is required