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Jumping between pages

Next & Previous page using keyboard

Running code using keyboard

I love ice cream

Simple math

Concatenating string

reverse to reverse string

upcase to convert string in capital letters

downcase to convert string in lowercase letters

strip to remove extra whitespaces

to_s to convert a number into a string

to_i to convert a string into a number

capitalize to convert only the first letter into capital letters

Method Chaining

First position is zero not 1

Last position is -1

start_with?

include? to check if a string is included or not

chars to convert string to characters

Interpolation using double quoted string

What is escape sequence

Print items I like

each to handle each item of the array

Use each to double the number

length to find the count of items in the array

length and to_s to print count of items I like

reverse to reverse items in an array

push to add an item to an array

Get item from a position

Get a subset of the string

Using variable

Variables to add numbers

Variable names

Variable scope

Comment

Variable assignment is not working

Why spaces in variable assignment

split to split a string into an array

Split string along comma

join to convert an array into a string

if condition

if else condition

If else with multiple conditions

Using elsif

String vs Integer

Difference between = and ==

Inline if condition

ternary operator

each to print value of each item

include? to find if value is in the range

to_a to convert range into array

Double dot vs Triple dot

Key Value Pair

Get value using key

merge! to add more data to hash

Add to hash using key directly

keys to list all keys

each to list all key and values

times to loop over items

even? and odd? methods to check if the number is even or odd

optional underscore

What is nil

nil is like false

What is symbol

to_sym to convert a string into a symbol

to_s to convert a symbol into a string

select to select certain items from array

reject to remove certain items from array

Using double arrow to add an item to an array

Concatenation

compact to remove all nil elements

uniq to remove all duplicate elements

flatten to remove all arrays

Removing elements from array using minus sign

Destructuring

Creating new array using percentage syntax

each_with_index to iterate of items using index

sort to sort items of array

Use new to create a hash

select to select some elements of the hash

reject to remove some elements from the hash

Default value in hash using default

Default value in hash using new

merge to add more data to hash

Single line comment

Multiple line comments

\d to match any digit

\d to match any digit more examples

Car maker class definition

Coffee maker class definition

Biscuit producer class definition

Many instances of a class

What is your class

What is the class of String and Integer

Instance methods on car

Instance methods on coffee

Instance methods on biscuit

Instance method only work on instances

Biscuit as a gift

Turn the car

Hot coffee Cold Coffee

Multiple arguments

Is my coffee hot or cold

Direction of car

Initializer in Coffeemaker

Initializer in Carmaker

Fahrenheit to Celsius Converter

Pound to Kilogram converter

Yards to Metere converter

Required argument in initialize

Method to return instance variable

Using attr_reader

Method to set instance variable

Using attr_writer

Method to set and get instance variable

Using attr_accessor

Ruby blocks introduction

Ruby blocks accepting arguments

Yield

Call block

Proc & Lambda

Module

Last module wins

Modules are not copy paste

Do not use for loop

Two spaces for indentation

Use spaces around operators

Use UpperCamelCase for class and module names

Blank line between method definitions

Blank line between classes