I want to know if there is a much cleaner way of doing this. Basically, I want to pick a random element from an array of variable length. Normally, I would do it like this:
myArray = ["stuff", "widget", "ruby", "goodies", "java", "emerald", "etc" ]
item = myArray[rand(myarray.length)]
Is there something that is more readable / simpler to replace the second line? Or is that the best way to do it. I suppose you could do myArray.shuffle.first
, but I only saw #shuffle
a few minutes ago on SO, I haven't actually used it yet.
myArray.sample(x)
can also help you to get x random elements from the array.
def random_items(array)
array.sample(1 + rand(array.count))
end
my_array = ["one", "two", "three"]
my_array.sample(1 + rand(my_array.count))
=> ["two", "three"]
=> ["one", "three", "two"]
=> ["two"]
myArray.sample
will return 1 random value.
myArray.shuffle.first
will also return 1 random value.
arr = [1,9,5,2,4,9,5,8,7,9,0,8,2,7,5,8,0,2,9]
arr[rand(arr.count)]
This will return a random element from array.
If You will use the line mentioned below
arr[1+rand(arr.count)]
then in some cases it will return 0 or nil value.
The line mentioned below
rand(number)
always return the value from 0 to number-1.
If we use
1+rand(number)
then it may return number and arr[number] contains no element.
class String
def black
return "\e[30m#{self}\e[0m"
end
def red
return "\e[31m#{self}\e[0m"
end
def light_green
return "\e[32m#{self}\e[0m"
end
def purple
return "\e[35m#{self}\e[0m"
end
def blue_dark
return "\e[34m#{self}\e[0m"
end
def blue_light
return "\e[36m#{self}\e[0m"
end
def white
return "\e[37m#{self}\e[0m"
end
def randColor
array_color = [
"\e[30m#{self}\e[0m",
"\e[31m#{self}\e[0m",
"\e[32m#{self}\e[0m",
"\e[35m#{self}\e[0m",
"\e[34m#{self}\e[0m",
"\e[36m#{self}\e[0m",
"\e[37m#{self}\e[0m" ]
return array_color[rand(0..array_color.size)]
end
end
puts "black".black
puts "red".red
puts "light_green".light_green
puts "purple".purple
puts "dark blue".blue_dark
puts "light blue".blue_light
puts "white".white
puts "random color".randColor
Source: Stackoverflow.com