CSC/ECE 517 Summer 2008/wiki1 6 jm

Introduction

Both Ruby and Java support arrays and hash tables

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