rubyhashternary

Ruby Ternary Inside Hash Build

Looking for a way to include a ternary conditional inside a hash assignment.

a = 5
h = {}
h[:alpha] => a > 3 ? true : false  # edited twice
h[:alpha] => (a > 3 ? true : false)    # edited twice

There has to be a way of shortening this up.

Solution

  • You need to assign the values by using = (assignment operator) and not =>.

    Try:

    h[:alpha] = a > 3 ? true : false

    Example:

    2.1.2-perf :001 > a = 5
 => 5
2.1.2-perf :002 > h = {}
 => {}
2.1.2-perf :005 > h[:alpha] = (a > 3 ? true : false)
 => true
2.1.2-perf :006 > h[:alpha]
 => true

    Edit (As per your comments):

    2.1.2-perf :014 > user = [1,2,3,4,5]
 => [1, 2, 3, 4, 5]
2.1.2-perf :016 > user[1] == "solo" ? "#{user[2]} #{user[3]} (s)" : "#{user[4]} (g)"
 => "5 (g)"