crystal Error: undefined method 'length' for Array(String)

Question

converting something from ruby to crystal

$ cat test.cr
puts ARGV.length

works in ruby, but crystal

$ crystal test.cr

Showing last frame. Use --error-trace for full trace.

error in line 1
Error: undefined method 'length' for Array(String)

Answer 1

appears the correct method is "size". crystal doesn't have as many aliases, to standardize.

$ cat test.cr
puts ARGV.size

$ crystal test.cr 1 2 3
3