some change

Summerlve · Mar 26, 2016 · 3b6598a · 3b6598a
1 parent eec946a
commit 3b6598a
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -12,3 +12,17 @@ cd $JS-OPTIONAL/test  <br />
 mocha test.js  <br />
 
 ### Common use cases
+``` javascript
+let version = Optional.ofNullable("3.0.0").orElse("defalut");
+
+version = Optional.ofNullable({version: "3.0.0"})
+                    .flatMap(value => Optional.ofNullable(value.version))
+                    .map(_ => _)
+                    .orElse("UNKNOWN");
+
+let isUSB3 = Optional.ofNullable("2.0")
+                    .filter(_ => _ === "3.0")
+                    .isPresent();
+
+assert.equal(false, isUSB3);
+```