Ruby Primer

Build a calculator that performs addition and subtraction

Find the length of strings in an array

• Everything is an object
• Splitting Strings
• Transforming arrays
• Building arrays
• Talking to objects
• String Length

Find the frequency of a string in a sentence

• Splitting Strings

Sort the words in a given sentence

• Splitting Strings
• String Length

Select random elements from an array

• Growing arrays

Hiring Programmers - Boolean Expressions in Ruby

• Beginner's Guide to Expressions in Ruby

Palindromes

• String case change
• Replacing a substring

Compute sum of cubes for given range

• Transforming arrays

Find non-duplicate values in an Array

Check if all elements in an array are Fixnum

• What do classes do?
• Looking up data in Arrays

Kaprekar's Number

• Looking up data in Arrays

Enough Contrast?

• Everything is an object
• Getting classy
• Talking to objects
• Invoking methods with arguments

Time to run code

• Lambdas

Number shuffle

• Transforming arrays
• Building arrays

Orders and costs

• Getting classy
• Extracting the keys and values from a Hash
• Arraying your arguments

Your Sum

• Getting classy
• Lambdas