CSC/ECE 517 Summer 2008/wiki1 6 jm: Difference between revisions

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|'''Check if Value Exists'''
|'''Check if Value Exists'''
|<code>h.value?("value1")</code>
|<code>h.value?("value1")</code>
|to do
|<code>h.contains(new String("value1"));</code>
|-
|-
|'''Retrieve a Value Given a Key'''
|'''Retrieve a Value Given a Key'''

Revision as of 17:32, 6 June 2008

Introduction

Both Ruby and Java support arrays and hash tables

Hashes in Ruby

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"]


Hashes in Java

Arrays in Java

Hashtable Function Ruby Java
Create h = {} or

h = Hash.new

h = new Hashtable();
Initialize h = {"key1" => "value1", "key2" => "value2" } TO DO
Add Key to Existing Hashtable h["key3"] = "value3" h.put("key3",new String("value3"));
Remove a Key - Value pair h.delete("key1") to do
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"] to do

External Links

Java Hastable Examples