From 31815c65933525e79b8a695cfd67d200c1915a37 Mon Sep 17 00:00:00 2001
From: Ahmad Hamdani <hamdaniryuuken@gmail.com>
Date: Mon, 24 Oct 2016 23:57:15 +0700
Subject: [PATCH 1/3] Update content

---
 Readme.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Readme.md b/Readme.md
index 59745f4..60c746a 100644
--- a/Readme.md
+++ b/Readme.md
@@ -21,9 +21,11 @@ install ruby dengan perintah `sudo apt-get install ruby`
 * Arrays
 * Code Blocks
 * Ranges
+* Iterator
 * Regular Expressions
 * Symbols
 * Hashes
+* Date & Time
 
 ## Session 2: OOP with Ruby
 
@@ -44,6 +46,7 @@ install ruby dengan perintah `sudo apt-get install ruby`
 * Classes as Objects
 * Metaprogramming
 * I/O
+* Multithreading
 
 ## Session 4: Testing
 

From 3e740c5dfeb990ddfcd14023353ad52c0f670bcd Mon Sep 17 00:00:00 2001
From: Ahmad Hamdani <hamdaniryuuken@gmail.com>
Date: Tue, 25 Oct 2016 00:55:18 +0700
Subject: [PATCH 2/3] Added content

I added content about basic Iterator
---
 Session1.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Session1.md b/Session1.md
index b640ef0..d7a611d 100644
--- a/Session1.md
+++ b/Session1.md
@@ -537,6 +537,18 @@ else
 end
 ```
 
+## Iterator
+Iterator merupakan salah satu fitur yang didukung oleh collections dalam ruby. collections merupakan object yang menyimpan sekumpulan data, seperti array dan hashes.
+
+```
+array = ["a", "b", "c", "d"];
+array.each do |i|
+	puts i
+end
+```
+
+Tiap nilai dari array disimpan dalam i dan ditampilkan ke console melalui puts.
+
 ## Regular Expressions
 
 _Regular Expression_ dalam ruby ditangani oleh kelas `Regexp`. 

From 46e8bd9ceb4c09a96e91aa70eb3bbe2a51ed116a Mon Sep 17 00:00:00 2001
From: Ahmad Hamdani <hamdaniryuuken@gmail.com>
Date: Tue, 25 Oct 2016 00:59:19 +0700
Subject: [PATCH 3/3] Added content

---
 Session3.md | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/Session3.md b/Session3.md
index 273bd9f..2b66603 100644
--- a/Session3.md
+++ b/Session3.md
@@ -304,3 +304,43 @@ end unless file.closed?
 
 file.close
 ```
+
+## Multitreading
+
+Program multithreading adalah program yang memiliki banyak thread yang dieksekusi.
+Dalam thread tiap block code dieksekusi secara sequential tapi thread sendiri bisa dieksekusi secara parallel dalam multicore cpu.
+
+cara membuat thread di ruby:
+Thread.new
+
+cara membuat multithreading :
+
+```ruby
+#!/usr/bin/ruby
+
+def func1
+   i=0
+   while i<=3
+      puts "func1"
+      sleep(1)
+      i=i+1
+   end
+end
+
+def func2
+   j=0
+   while j<=3
+      puts "func2"
+      sleep(2)
+      j=j+1
+   end
+end
+
+t1=Thread.new{func1()}
+t2=Thread.new{func2()}
+t1.join
+t2.join
+puts ""
+```
+
+selengkapnya di : https://www.tutorialspoint.com/ruby/ruby_multithreading.htm