Created
July 10, 2020 10:51
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# string | |
"Hello world" | |
# integer | |
423 | |
# float | |
3.14 | |
# array | |
[ "micheal", "francis" ] | |
# range | |
(1..10) | |
# booleans | |
true | |
false && true || false | |
# Hash | |
my_hash = {} | |
p my_hash |
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students = ['Peter', 'Mary', 'George', 'Emma'] | |
student_ages = [24, 25, 22, 20 ] | |
# indexes 0. 1. 2. 3 | |
students.each_with_index do |student, index| | |
puts "#{student} is #{student_ages[index]} years old" | |
end | |
# CRUD ARRAY | |
# C array = [ "Peter", "Mary", "George", "Emma" ] | |
# R array[0] | |
# U array[0] = new_value | |
# D array.delete_at(index) |
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# CRUD HASH | |
# Create | |
ages = { | |
'Peter' => 24, | |
'Mary' => 25, | |
'George' => 22 | |
} | |
# Hash.new | |
# p ages | |
# Read | |
ages["Peter"] | |
# p "Peter is #{ages["Peter"]}" | |
# Update a value | |
ages['Peter'] += 1 | |
# p ages['Peter'] | |
# Add a new Key Value pair | |
ages['Seb'] = 18 | |
# p ages['Seb'] | |
# Delete | |
ages.delete('Peter') | |
ages['Ringo'] = 100 | |
# p ages |
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paris = { | |
'country' => 'France', | |
'population' => 2211000 | |
} | |
# p paris['country'] | |
# p paris['population'] | |
# paris['monument'] = 'Tour de Eiffel' | |
# p paris['monument'] | |
# paris['population'] += 9000 | |
# p paris['population'] | |
# paris.each do |key, value| | |
# puts "#{value}" | |
# puts "Paris' #{key} is #{value}" | |
# end |
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paris = { | |
'country' => 'France', | |
'population' => 2211000 | |
} | |
p paris.key?('country') | |
#=> true | |
p paris.key?('monument') | |
#=> false | |
p paris.value?(2211100) | |
#=> true | |
p paris.value?(123123123123) | |
#=> false | |
# to get all the values: | |
p paris.values | |
# to get all the keys: | |
p paris.keys | |
p paris.size | |
#=> 2 |
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# basic symbol | |
p :hello | |
# Transform to a symbol | |
p "goodbye".to_sym | |
:hello == "hello" | |
#=> false |
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# 1) With Stings as identifiers | |
paris = { | |
"country" => "France", | |
"population" => 2211000 | |
} | |
# 2) With Symbols as identifiers (maintaining the arrow) | |
paris = { | |
:country => 'France', | |
:population => 2211000 | |
} | |
# 3) Modern Syntax with Symbols | |
paris = { | |
country: 'France', | |
population: 2211000 | |
} | |
p paris[:county] # for 2 and 3 | |
p paris["country"] # for 1 |
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# the last argument in a method can be accepted as a hash! | |
def tag(name, content, attrs = {}) | |
tag_attrs = attrs.map { |k, v| "#{k}='#{v}'" }.join(' ') | |
return "<#{name} #{tag_attrs}>#{content}</#{name}>" | |
end | |
# we can even drop the curly braces! (notice the key value pairs after 'Hello World') | |
tag('h1', 'Hello world', class: 'italics', id: 'batch-423') |
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require 'csv' | |
# similar to the Date object we need to | |
# import this to help us out! | |
CSV.foreach('cities.csv') do |row| | |
# each row is an array | |
# p row | |
# a nice 'puts' to print out our data | |
puts "#{row[0]} has a population of #{row[1]}, its monument is #{row[2]}" | |
end |
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Paris | 2211000 | 'Tour Eiffel' | |
---|---|---|---|
London | 8308000 | 'Big Ben' | |
Berlin | 4000000 | 'Alexander Platz' |
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{ | |
"name": "Paris", | |
"population": 2211000 | |
} |
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require 'open-uri' # require to open links (urls) | |
require 'json' # require this to parse/extract JSON | |
# ask our user for his githubname | |
puts "What is your githubname?" | |
githubname = gets.chomp | |
# the link to the API | |
url = "https://api.github.com/users/#{githubname}" | |
# open the link and read it | |
user_info = open(url).read | |
# parse the information | |
json = JSON.parse(user_info) | |
# display a nice sentence to the user, with the info | |
puts "#{json["name"]} works at #{json["company"]}" |
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