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ph3nx / array_sorting.rb
Created January 19, 2014 20:45
Some ways to sort arrays in Ruby. Copy and paste the code examples in the irb console to try them.
array = [3,7,1,9,2,12,34,0]
# sort in ascending order
array.sort
# => [0, 1, 2, 3, 7, 9, 12, 34]
# sort in descending order
array.sort.reverse
# => [34, 12, 9, 7, 3, 2, 1, 0]
@ph3nx
ph3nx / combined_comparison_operator.rb
Created January 19, 2014 17:55
The combined comparison operator is used to compare two objects in Ruby. It returns 0 if they are the same. 1 if the first operand is greater and -1 if it's less.
a1 = "A Test"
a2 = "A Boom"
a1 <=> a2
# => 1
b1 = "2"
b2 = "9"
b1 <=> b2
@ph3nx
ph3nx / divisible_by_three?.rb
Created January 19, 2014 16:54
Ruby method that checks whether a number is evenly divisible by three or not. The function uses Ruby's ternary operator, which is a shorthand for the if-else control structure. It's a best pratice to end method names with a question mark when they return boolean values (true || false).
def by_three? number
number % 3 == 0 ? true : false
end
by_three? 5
# => false
by_three? 9
# => true
@ph3nx
ph3nx / splat_arguments.rb
Created January 19, 2014 16:42
Example Ruby method with a splat argument. Splat arguments are preceded by a *. You use them when you don't know how many arguments there will be.
def greet message, *people
people.each { |p| puts "#{message}, #{p}!" }
end
greet "Hello", "Tony", "Ann", "BadMan"
@ph3nx
ph3nx / english_2_pig_latin.rb
Created January 18, 2014 18:51
Ruby program with functions that translate english to Pig Latin and back to English. English is translated to Pig Latin by taking the first letter of every word, moving it to the end of the word and adding ‘ay’. “The quick brown fox” becomes “Hetay uickqay rownbay oxfay”.
def english_2_pig_latin string
string.split(/ /).each do |word|
word << word[0] << "ay "
print word[1..word.length]
end
end
@ph3nx
ph3nx / list_to_frame.rb
Created January 18, 2014 18:32
This Ruby program is a ruby function / method that prints a list / array in a rectangular frame of stars.
def list_to_frame list=[]
list = ["Hello", "World", "in", "a", "frame"] if list.empty?
longest = 0
list.each do |element|
longest = element.length if longest < element.length
end
(0..longest+3).each do
@ph3nx
ph3nx / prime_numbers.rb
Last active July 17, 2021 07:16
Ruby program / method that prints out all prime numbers until a given maximum.
def prime_numbers max
for i in (2..max) do
for j in (2..i) do
break if i%j == 0
end
p "#{i} is a prime number." if i == j
end
end
require 'prime'
@ph3nx
ph3nx / multiplication_table.rb
Created January 18, 2014 14:20
Ruby program that prints a multiplication table for numbers up to your input. For example 12 x 12 fields.
def tbl max
for y in (1..max) do
for x in (1..max) do
sol = y*x
if sol < 10
print "#{sol} "
elsif sol < 100
print "#{sol} "
else
print "#{sol} "
@ph3nx
ph3nx / sum_or_product.rb
Last active January 3, 2016 16:39
Ruby program that asks the user for a number num and computes either the sum or the product of all numbers starting at 1 until this number.
def sum_or_product
print 'Enter any number bigger 1: '
num = gets.to_i
print 'sum [s] or product [p]? '
opt = gets.chomp
if opt == 's'
(1..num).inject :+
elsif opt == 'p'
@ph3nx
ph3nx / sum_to.rb
Last active January 3, 2016 16:29
Ruby program that asks the user for a number and prints the sum of the numbers 1 to the number he chose.
def sum_to
print 'Enter any number greater than 1: '
input = gets.to_i
sum = 0
for a in 1..input do
sum += a
end