Builtin Functions

print(STRING|ARRAY|HASH|BOOLEAN|INTEGER|NIL|FILE)

Prints the string representation of the given object to STDOUT.

🚀 > print("test")
test

🚀 > print([1,2,3])
[1, 2, 3]

🚀 > print(["test",true,3])
["test", true, 3]

raise(STRING)

Returns an ERROR object carrying the given message -- the same kind of value any other builtin returns when something goes wrong, just returned on purpose. A rescue block (see Error) can catch it and carry on. Left uncaught, it aborts the rest of the program and becomes its result, so the process exits with status 1.

OS.raise(code, message) used to exist alongside this and looked like a duplicate, but was not one: it let the caller choose the process's exit code, where an uncaught raise always exits 1. It was removed anyway, because the same effect is reachable as print(message); OS.exit(code).

🚀 > raise("broken")
ERROR: broken

🚀 > def test()
       raise("broken")
     rescue e
       print("caught: " + e.message())
     end
🚀 > test()
caught: broken