askn / crystal-by-example Goto Github PK

I would like to see some simple examples for writing text to a file, especially appending.

result = String.build do |io|
io.json_object do |object|
object.field "address", "Crystal Road 1234"
object.field "location" do
io.json_array do |array|
array << 12.3
array << 34.5
end
end
end
end

Error: undefined method json_object for String::Builder

class Foo
abstract def foo
end

Compiler now complains: Error: can't define abstract def on non abstract class

Cheers,
Ivo Balbaert

Can we get an exaple for the logger class? I could create one, but I'm not sure about the .format= option (Thats why I'm here, anyway)

Could be useful to add C-binding examples to the list

• default error class for rescue
• Interrupt Ctrl+c example
• Would be nice to see diffs w/Ruby error hierarchy (StandardError vs Exception vs RuntimeError, Interrupt ctrl+c, etc)

Line ch1 = generator(1)
now (Crystal 0.20) gives the Error: instantiating 'generator(Int32)', undefined constant T.

How should this be corrected?
Thanks!