How to call a method using user input

Question

I have 2 methods -- Add and Delete -- I was wanting to call them using user input.

So instead of this long code

def delete; end
def add; end

case gets.chomp
    when 'Add'
      add
    when 'Delete'
      delete
end

I'm looking for something along the lines of what the key word eval does.

eval gets.chomp

That way if the input is 'add' then it will execute the 'add' method

Any ideas? Thanks!

Edit--- I'm an idiot. Eval works. It appeared to not be working because I had an error else where. Regardless thanks for the answers!

Peter Pei Guo · Accepted Answer · 2014-09-22 23:43:31Z

1

Something like this:

def a
    puts "1"
end

def b
    puts "2"
end

while true
    eval(gets.chomp)
end

answered Sep 22, 2014 at 23:43

Peter Pei Guo

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Comments

Daniel S · Accepted Answer · 2014-09-22 23:44:05Z

1

You can invoke methods by symbol using send:

send gets.chomp

answered Sep 22, 2014 at 23:44

Daniel S

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Comments

Abdullah Aden · Accepted Answer · 2014-09-23 07:07:01Z

0

your code should work if tweeked like this:

def delete; end
def add; end

puts "please chose a method add or delete"
ans = gets.chomp.downcase

case ans
    when 'add'
      add
    when 'delete'
      delete
    else 
puts "nothing selected"
end

edited Sep 23, 2014 at 7:07

answered Sep 23, 2014 at 6:57

Abdullah Aden

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1 Comment

Schylar Over a year ago

I specifically said I didn't want a case statement like code

bader · Accepted Answer · 2016-05-07 11:49:54Z

0

You can use "send" method, first put your methods in a class then Try this:

    class Methods
       def show
         print "show"
       end
     end
    print "Enter your method name: "
    methodName = gets.chomp
    methodName.to_sym
    myMethods = Methods.new
    meMethods.send(methodName)

Try it! You can use this way to make new programming languages or HUGE programs.

answered May 7, 2016 at 11:49

bader

1

1 Comment

bader Over a year ago

I ment at the last line myMethods not meMethods

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