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A really cool thing about Ruby is that you can always convert between different types using Ruby's "to" methods.

• to_s converts values to strings.
• to_i converts values to integers (numbers.)
• to_a converts values to arrays.

Strings have .reverse property eg "Chee".reverse => "eejC"

ARRAYS

Arrays are basically list of stored information.

Create empty array
[]

[517, 66, 07].max => 517

Assign array to a variable

nric=>[517, 66, 07]

Sort an Array

nric.sort =>[07,66,517]
nric=>[517, 66, 07]

// ! permanently sort 

nric.sort! =>[07,66,517]

nric =>[07,66,517]

Query Array

nric.include? 67 =>false
nric.include? 07 =>true

Comple list of string methods

Hash

Hashes store related information by giving reusable labels to pieces of data.

Create Hash aka Dictionary.
books={}

or

ratings=Hash.new(0)

Stuffing an Array

books["Inferno"] = :splendid
books["Kublai Khan"] = :historical
books["Davinci Code"]=:exciting

books => {"Inferno"=>:splendid, "Kublai Khan=>:historical, "Davinci Code"=>:exciting}

Block

Basically, a block is a chuck of ruby code