This is what I'm trying to do:
def call_block(in_class = "String", &block)
instance = eval("#{in_class}.new")
puts "instance class: #{instance.class}"
instance.instance_eval{ block.call }
end
# --- TEST EXAMPLE ---
# This outputs "class: String" every time
"sdlkfj".instance_eval { puts "class: #{self.class}" }
# This will only output "class: Object" every time
# I'm trying to get this to output "class: String" though
call_block("String") { puts "class: #{self.class}" }
On the line where it says "instance.instance_eval{ block.call }", I'm trying to find another way to make the new instance variable run instance eval on the block. The only way I can think of to get it to do that is to pass instance_eval the original block, not as a variable or anything, but as a real block like in the test example.
Any tips?
Yes. You can pass the block to the other method by prepending the block variable with an ampersand like so:
def foo &blk
# now, blk is a variable bound to a block object
bar &blk
end
The reason your are getting "class: Object" is that Ruby uses lexical scoping. This means that self in puts "class: #{self.class}" refers to main, the default context.