Ruby Basic

Ruby
1

Hi All,

def one
puts “hi”
end

Once i call one --> i can able to get a output.

QUESTION:

I have a array method_list=[“one”]

How can I convert “one” to method ?

2

Raveendran .P wrote:

Hi All,

def one
puts “hi”
end

Once i call one --> i can able to get a output.

QUESTION:

I have a array method_list=[“one”]

How can I convert “one” to method ?
Tried and Got Solution

Solution:

eval(“one”)

Thanks

3

On Mon, Jun 21, 2010 at 1:00 PM, Raveendran .P [email protected]
wrote:

QUESTION:

I have a array method_list=[“one”]

How can I convert “one” to method ?
Tried and Got Solution

Solution:

eval(“one”)

I’d rather use send:

irb(main):001:0> def one
irb(main):002:1> “hi”
irb(main):003:1> end
=> nil
irb(main):004:0> list = %w{one}
=> [“one”]
irb(main):005:0> send(list.first)
=> “hi”

Jesus.

4

Jesús Gabriel y Galán wrote:

Solution:

eval(“one”)

I’d rather use send:

irb(main):001:0> def one
irb(main):002:1> “hi”
irb(main):003:1> end
=> nil
irb(main):004:0> list = %w{one}
=> [“one”]
irb(main):005:0> send(list.first)
=> “hi”

There are some other options too.

(1) a (bound) Method object, which includes both the receiver and the
method.

class Person
def initialize(name)
@name = name
end
def greet
puts “hi I’m #{@name}”
end
end

fred = Person.new(“Fred”)
m = fred.method(:greet)

m.call

compare Jesús’ suggestion: fred.send(:greet)

(2) use a lambda instead of a method

m = lambda { puts “Hello” }
m.call

This also has access to surrounding local variables (closure)

c = 0
m = lambda { c += 1; puts “Call number #{c}” }
m.call
m.call
m.call

5

Hi Josh,Brain and Galan,

Thanks for your help.

Regards
Raveendran P

6

On Mon, Jun 21, 2010 at 5:52 AM, Raveendran .P [email protected]
wrote:

I have a array method_list=[“one”]

How can I convert “one” to method ?

Posted via http://www.ruby-forum.com/.

In general, you can convert a string / symbol to the method it is maning
by
using the method “method”
http://ruby-doc.org/core/classes/Object.html#M000336

def one() “hi” end
def two() “hello” end
def three() “hola” end

method_names = private_methods(false).reject { |name| name.size > 5 }
method_names # => [“three”, “two”, “one”]

method_list = method_names.map { |name| method name }
method_list # => [#<Method: Object#three>, #<Method: Object#two>,
#<Method:
Object#one>]

method_results = method_list.map { |meth| meth.call }
method_results # => [“hola”, “hello”, “hi”]