I'm trying to pass an array and a block to a function but am getting the following errors:
./rb:7: syntax error, unexpected tSTRING_BEG, expecting keyword_do or '{' or '('
test( [0,1,2,3], {puts 'string'} )
^
./rb:7: syntax error, unexpected '}', expecting end-of-input
test( [0,1,2,3], {puts 'string'} )
Code in question:
1 #!/usr/bin/env ruby
2
3 def test(arr, &b)
4 b.call
5 end
6
7 test( [0,1,2,3], {puts 'string'} )
The block shouldn't be passed as a parameter to the method 'test'.
The following will work:
test([0,1,2,3]) {puts 'string'}
Alternatively, you can create a proc (which is an object unlike a block) and pass it to the 'test' method.
p = Proc.new {puts 'string'}
test([0,1,2,3], &p)
test [0,1,2,3] do puts 'string' end if you don't want to use parenthesis.Methods can accept either unnamed/unassigned block in form method(args) {unnamed block} or assigned to proc/lambda/whatever passed as a normal argument in form method(args, &object), where an ampersand symbol means an argument is attempted to convert to Proc with #to_proc method.
test([0,1,2,3], &->{puts 'string'}) # lambda
test([0,1,2,3], &MyClass.new) # MyClass should implement to_proc
class MyClass
def to_proc
puts 'string'
end
end
