isBase64 and clone functions

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

lib/utils/fun.js

@@ -25,6 +25,13 @@ const equalsOrThrow = (v1, v2, t) =>
     ? true
     : (() => {throw t;})());
 
+const isBase64 = (value) =>
+  Buffer.from(value, "base64").toString("base64") === value;
+
+
+const clone = (o) =>
+  JSON.parse(JSON.stringify(o));
+
 module.exports = {
   isString,
   isStringOrThrow,
@@ -34,5 +41,7 @@ module.exports = {
   isDefinedOrThrow,
   isStringOrObjectOrThrow,
 
-  equalsOrThrow
+  equalsOrThrow,
+  isBase64,
+  clone
 };

test/fun_tests.js

@@ -29,4 +29,18 @@ describe("Functional approach", () => {
         .equals(true);
     });
   });
+
+  describe("isBase64", () => {
+    it("should return false when is not base64 string", () => {
+      let actual = fun.isBase64("non base 64");
+
+      expect(actual).to.equal(false);
+    });
+
+    it("should return true when is a base64 string", () => {
+      let actual = fun.isBase64("Y2xvdWRldmVudHMK");
+
+      expect(actual).to.equal(true);
+    });
+  });
 });