Ruby Programming Language

4.

Collections and Data Structures

4.1.

4.1.1.

Creating Arrays

4.1.1.1.

4.1.1.2.

4.1.1.3.

Array Constructor Methods

4.1.1.4.

Splitting Strings to Arrays

4.1.2.

Accessing Elements

4.1.2.1.

4.1.2.2.

Negative Indexes

4.1.2.3.

4.1.2.4.

4.1.2.5.

4.1.3.

Modifying Arrays

4.1.3.1.

Adding Elements

4.1.3.1.1.

4.1.3.1.2.

4.1.3.1.3.

4.1.3.1.4.

4.1.3.1.5.

4.1.3.2.

Removing Elements

4.1.3.2.1.

4.1.3.2.2.

4.1.3.2.3.

4.1.3.2.4.

4.1.3.2.5.

4.1.3.3.

Updating Elements

4.1.3.3.1.

Direct Assignment

4.1.3.3.2.

4.1.4.

Common Array Methods and Iteration

4.1.4.1.

length and size

4.1.4.2.

4.1.4.3.

4.1.4.4.

index and rindex

4.1.4.5.

sort and reverse

4.1.4.6.

4.1.4.7.

4.1.4.8.

4.1.4.9.

4.1.4.10.

map, select, reject

4.1.4.11.

each_with_index

4.1.4.12.

4.2.

4.2.1.

Creating Hashes

4.2.1.1.

4.2.1.2.

4.2.1.3.

4.2.2.

Using Symbols as Keys

4.2.2.1.

4.2.2.2.

String vs Symbol Keys

4.2.3.

Accessing and Assigning Values

4.2.3.1.

Bracket Notation

4.2.3.2.

4.2.3.3.

4.2.3.4.

Default Value Handling

4.2.4.

Modifying Hashes

4.2.4.1.

Adding and Removing Pairs

4.2.4.2.

delete and delete_if

4.2.4.3.

4.2.4.4.

merge and merge!

4.2.5.

Common Hash Methods and Iteration

4.2.5.1.

keys and values

4.2.5.2.

4.2.5.3.

each_key and each_value

4.2.5.4.

has_key? and has_value?

4.2.5.5.

key? and value?

4.2.5.6.

4.2.5.7.

select and reject

4.2.5.8.

transform_keys and transform_values

4.3.

4.3.1.

Inclusive Ranges

4.3.1.1.

Double Dot Syntax

4.3.1.2.

4.3.2.

Exclusive Ranges

4.3.2.1.

Triple Dot Syntax

4.3.2.2.

4.3.3.

Creating Ranges

4.3.3.1.

4.3.3.2.

Character Ranges

4.3.3.3.

Custom Object Ranges

4.3.4.

Ranges in Conditionals and Loops

4.3.4.1.

case Statements

4.3.4.2.

4.3.4.3.

Membership Testing

4.3.5.

Converting Ranges to Arrays

4.3.5.1.

4.3.5.2.

Memory Considerations

4.3.6.

4.3.6.1.

cover? vs include?

4.3.6.2.

4.3.6.3.

4.4.

4.4.1.

Creating and Using Sets

4.4.1.1.

4.4.1.2.

Requiring 'set' Library

4.4.1.3.

Array to Set Conversion

4.4.2.

4.4.2.1.

4.4.2.2.

4.4.2.3.

4.4.2.4.

Subset and Superset

4.4.2.5.

4.4.3.

4.4.3.1.

4.4.3.2.

include? and member?

4.4.3.3.

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3. Control Flow and Logic

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5. Methods, Blocks, Procs, and Lambdas