Armstrong numbers in ruby
As already suggested you can utilise digits. Used with reduce you can write something like this: number.select { |n| n.digits.reduce(0) { |m, n| m + n**3 } == n } #=> [153, 370]
ruby
Unable to eval string with ‘
eval expects a string with expression representing valid Ruby code.
How to translate a ‘greeting_for’ function from Ruby to Javascript [closed]
It can be translated to JavaScript as: function greeting_for (name) { return `Hello, ${name}!` } console.log( greeting_for( “Marty” ) )
Format a string containing Phone numbers
This will take care of 0‘s in between the phone numbers phone=”08763843478,+918763843478,08763843478,+918763843478,+918763840008″ phone.split(‘,’).map{|num| num.gsub(/^\+91|^0/, ”)}.join(‘,’) #=> “8763843478,8763843478,8763843478,8763843478,8763840008”
Rails where clause is not working for some of the values
Tracker.where(name: “Permits Required”)
How to calculate factorial in ruby [duplicate]
To get factorial of n (1..n).inject :* To take care of zero (1..n).inject(1, :*)
How to get the last character of a string in an array [closed]
your variable name should not start with Capital letter, > down = [“up 1”, “up 2”, “up 3”] > numbers_ary = down.map{|s|s[-1]} #=> [“1”, “2”, “3”] OR > numbers_ary = down.map{|s| s.chars.last} #=> [“1”, “2”, “3”] make a conditional statement like for.each based on the result If you make a loop of an array and … Read more
mysql to pdf – python or ruby [closed]
In Ruby you have a number of options for your PDF authoring, and your DB management is very easy if you use the ActiveRecord library (comes with Rails) or Sequel to read or write data. Complete and heavy duty PDF authoring can be done using Prawn… it requires some studying, but it’s an amazing library. … Read more
Get all three digit numbers from array and store in new array [closed]
Why regular expression on numbers? You can select all numbers less than 1000 and greater than 99. my_array.select { |n| n<1000 && n>99 }
how to i add objects to an array ? ruby
I think the following will be of some help to get started: class Dog def speak puts “woof” end end class Cat def speak puts “meow” end end class PetLover attr_accessor :species def initialize @species = [Dog, Cat] end def random_animal @species[rand(@species.size)].new end def animals(n) ary = [] n.times do ary << random_animal end ary … Read more