Function to validate types

Signed-off-by: Fabio José <fabiojose@gmail.com>

lib/utils/fun.js

@@ -3,6 +3,11 @@ const isString = (v) => (typeof v) === "string";
 const isObject = (v) => (typeof v) === "object";
 const isDefined = (v) => v && (typeof v) != "undefined";
 
+const isBoolean = (v) => (typeof v) === "boolean";
+const isInteger = (v) => Number.isInteger(v);
+const isDate = (v) => (v instanceof Date);
+const isBinary = (v) => (v instanceof ArrayBuffer);
+
 const isStringOrThrow = (v, t) =>
   (isString(v)
     ? true
@@ -47,6 +52,11 @@ module.exports = {
   isObject,
   isDefined,
 
+  isBoolean,
+  isInteger,
+  isDate,
+  isBinary,
+
   isDefinedOrThrow,
   isStringOrObjectOrThrow,