CSC/ECE 517 Summer 2008/wiki1 6 jm

Introduction

Both the Ruby and Java languages support Array and Hashtable data structures as part of the language.

Arrays in Ruby

Creating Arrays in Ruby

Creating an array in Ruby is as simple as

  a = []

Initializing an Array in Ruby

  a = ["one",45,"hello"]

Array Comparison

Array Function	Ruby	Java
Create	h = [] or h = Array.new	todo
Initialize	h = ["one",1,"two"]	todo
Element Access	h[0]	h[0]

Hashtable Comparison

Hashtable Function	Ruby	Java
Create	h = {} or h = Hash.new	h = new Hashtable();
Initialize	h = {"key1" => "value1", "key2" => "value2" }	Not Available
Add Key to Existing Hashtable	h["key3"] = "value3"	h.put("key3",new String("value3"));
Remove a Key - Value pair	h.delete("key1")	h.remove
Check if Key Exists	h.key?("key1")	h.containsKey("key1")
Check if Value Exists	h.value?("value1")	h.contains(new String("value1"));
Retrieve a Value Given a Key	h["key1"]	h.get("key1")

External Links

Java Hastable Examples