How to programmatically define a global function within a function or method?

Question

For example,

def makeFunction name
    ... #define a function with the name supplied
end

makeFunction 'functionMade'
functionMade

I know it's possible to make a global variable $functionMade through lambda or proc, but is it possible to make it really a function without the $ prefix?

Marian Theisen · Accepted Answer · 2011-10-03 10:10:07Z

2

i think via class_eval on Kernel:

Kernel.class_eval <<-RUBY
  def abc
    puts 'abc'
  end
RUBY

but i wouldn't recommend that. what do you need it for, or are you just curious?

answered Oct 3, 2011 at 10:10

Marian Theisen

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5 Comments

albert Over a year ago

Cool! I want to generate a set of functions as specified in an externally loaded JSON. :)

Marian Theisen Over a year ago

:D indeed! Remember eval is Evil

Andrew Grimm Over a year ago

@albert: Have you looked at whether Struct or OpenStruct would suit your needs?

Tilo Over a year ago

that's dangerous.. you could accidentally monkey-patch / override something that's built-in to Ruby.. Danger Will Robinson!

albert Over a year ago

@AndrewGrimm: I am making an assembly code generator. There are hundreds of instructions from the datasheet. I just paste the spec such as 'ADC{S}<c><q> {<Rd>,} <Rn>, #<const>', and parse it to make functions, so that the Ruby code look like the assembly code. adc R1, R2, 100 This produce the actual assembly code, adc R1, R2, #100 I have done this in javascript, but Ruby seems to be much more close for the code generation purpose.

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