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F4SDwebService/Scripts/src/utils/isFunction.js

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+/**
+ * Check if the given variable is a function
+ * @method
+ * @memberof Popper.Utils
+ * @argument {Any} functionToCheck - variable to check
+ * @returns {Boolean} answer to: is a function?
+ */
+export default function isFunction(functionToCheck) {
+  const getType = {};
+  return (
+    functionToCheck &&
+    getType.toString.call(functionToCheck) === '[object Function]'
+  );
+}