02. Ruby Basic slides - Ruby Core Teaching

Jul 19, 20240 likes318 views

The document provides an overview of Ruby programming concepts, including comments, variable types, and the differences between blocks, procs, and lambdas. It explains key aspects such as the significance of magic comments, the syntax for defining blocks, and the advantages and disadvantages of using each construct. Additionally, it covers operators, keywords, and various data types in Ruby.

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Contents
COMMENT
BLOCK, PROC & LAMBDA
DATA TYPES
VARIABLE
LITERAL
OPERATORS
KEYWORD

Comment
Use for code notes.
Not translated by interpreter.
NORMAL COMMENT
While comments are typically ignored by Ruby,
special “magic comments” contain directives that
affect how the code is interpreted.
MAGIC COMMENT

02. Ruby Basic slides - Ruby Core Teaching

Variables
A VARIABLE IS SIMPLY A NAME FOR A VALUE.
VARIABLES ARE CREATED AND VALUES
ASSIGNED TO THEM BY ASSIGNMENT
EXPRESSIONS.
Global variable - $ sign
Instance variable - @ sign
Class variable - @@ sign
Local vatiable - no sign
Constants - Capital letters
KINDS OF VARIABLES:

Block, Proc & Lambda
A very important concept that most of Ruby programmers
misunderstand(including the slides maker!)
The only ones that definitely understand the concept are the Ruby
committers and Rails committers!

Block
A way to group lines of code together
Blocks are enclosed in a do / end statement or between brackets {},
and they can have multiple arguments.
Syntax
Including conditional statement:

Block
Yield is a Ruby keyword that calls a block when you use it.
When you use the yield keyword, the code inside the block will run &
do its work.

Block
Widely used in Ruby more than Proc and Lambda
Advantages
Simple, easy to use
Disadvantages
One time use only (New block must be generated when input
changed)
Leads to code duplication

Proc
Proc is an object that should be stored in a variable
Proc is essentially just a named block to be reuse multiple times
→ Overcome the disadvantages of block

Lambda
Lambda is a function with no specific name
Object of Proc class
Return a value
Used to assign a piece of code
Syntax:
Example:

Lambda
Object of Proc class, so when using, use call:

! + - ~ * ** / %
<< >> & | ^
== === != <=> >= >
< <= = %= /= -=
+= *= **= .. ... not
and or ?: && ||
Operators

Keyword
Priority words in Ruby
Usually used as commands to perform an action
When set name for variable, do not match the keyword name

alias and BEGIN begin break case
class def defined? do else elsif
END end ensure false for if
in module next nil not or
redo recuse retry return self super
then true undef unless until when
while yield
Keyword

Data type
Boolean
Symbol
Integer, Float, Rational Number
Nil value: A singleton object of a NilClass. Represents the
absence of value.(In other programming languages, it is a null)
String
Arrays and Hashes
Read more in the https://ruby-doc.org/

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1. RUBY BASIC Hoang Quan(BlazingRockStorm)

2. Contents COMMENT BLOCK, PROC & LAMBDA DATA TYPES VARIABLE LITERAL OPERATORS KEYWORD

3. Comment

4. Comment Use for code notes. Not translated by interpreter. NORMAL COMMENT While comments are typically ignored by Ruby, special “magic comments” contain directives that affect how the code is interpreted. MAGIC COMMENT

6. Variables

7. Variables A VARIABLE IS SIMPLY A NAME FOR A VALUE. VARIABLES ARE CREATED AND VALUES ASSIGNED TO THEM BY ASSIGNMENT EXPRESSIONS. Global variable - $ sign Instance variable - @ sign Class variable - @@ sign Local vatiable - no sign Constants - Capital letters KINDS OF VARIABLES:

8. Global Variable

9. Instance Variables

10. Class Variables

11. Local Variable

12. Constant

13. Literal

14. Literal

15. Block, Proc & Lambda

16. Block, Proc & Lambda A very important concept that most of Ruby programmers misunderstand(including the slides maker!) The only ones that definitely understand the concept are the Ruby committers and Rails committers!

17. Block A way to group lines of code together Blocks are enclosed in a do / end statement or between brackets {}, and they can have multiple arguments. Syntax Including conditional statement:

18. Block Yield is a Ruby keyword that calls a block when you use it. When you use the yield keyword, the code inside the block will run & do its work.

19. Block Widely used in Ruby more than Proc and Lambda Advantages Simple, easy to use Disadvantages One time use only (New block must be generated when input changed) Leads to code duplication

20. Proc Proc is an object that should be stored in a variable Proc is essentially just a named block to be reuse multiple times → Overcome the disadvantages of block

21. Lambda Lambda is a function with no specific name Object of Proc class Return a value Used to assign a piece of code Syntax: Example:

22. Lambda Object of Proc class, so when using, use call:

23. Operators

24. ! + - ~ * ** / % << >> & | ^ == === != <=> >= > < <= = %= /= -= += *= **= .. ... not and or ?: && || Operators

25. Keyword

26. Keyword Priority words in Ruby Usually used as commands to perform an action When set name for variable, do not match the keyword name

27. alias and BEGIN begin break case class def defined? do else elsif END end ensure false for if in module next nil not or redo recuse retry return self super then true undef unless until when while yield Keyword

28. Data type

29. Data type Boolean Symbol Integer, Float, Rational Number Nil value: A singleton object of a NilClass. Represents the absence of value.(In other programming languages, it is a null) String Arrays and Hashes Read more in the https://ruby-doc.org/

30. Thank you! ありがとうございます！

02. Ruby Basic slides - Ruby Core Teaching

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