Something like $$ in php

rubyonrails-talk
1

Hi all. I have this piece of code: Parked at Loopia. How can I use the string in 'name' to use as a method of declaration?

$methodname = 'new' Just like using $obj->$methodname in php?

2

Hi all. I have this piece of code: Parked at Loopia. How can I use the string in 'name' to use as a method of declaration?

obj = MyObject.new meth = "my_method" obj.send(meth) # same as obj.my_method

-philip

3

You could get in a lot of trouble for sending meth.

4

Thanks for the replies.

What I also want, is to create a function with a variable name.

So if meth = 'thing'

I want to create a method like

thing_some_method()

Is there a simple way to do that?

I thought about using alias_method. Would that be a good idea? Or can it be done simpeler?

5

Use a variable function ie

$func = “calculate”;

$result = $func();

6

Thanks. But could I create the function "calculate" on the fly?

7

This might be not what you want, but how about using Proc instances stored in a hash:

procs[:some_action1] = lambda{ |a,b|     a + b }

procs[:some_action2] = lambda{ |a,b|     a - b }

puts procs[:some_action1].call(2,5) puts procs[:some_action2].call(2,5)

Cheers, Yuri

8

I’m not sure if I follow but would object#send :thing work?

9

One more possible solution: