argument 0 to method '<' must be a Sequence, not a 'Number'

[yegor256]

I'm doing this:

n := System args at(1)
if(n < 0, writeln("n must be positive!"))

I'm getting:

Exception: argument 0 to method '<' must be a Sequence, not a 'Number'

What's wrong?

[yegor256]

apparently, this works:

n := System args at(1) asNumber
if(n < 0, writeln("n must be positive!"))

[stevedekorte]

Hm, that looks like it might be a bug in the error message where it swaps the required and given types.

[zephyrtronium]

Looks right to me. The receiver of < is a string, so it expects a string to compare to, but the argument is 0. Hence, "must be a Sequence, not a 'Number'."

[stevedekorte]

Yes, that sounds right.

Looks right to me. The receiver of < is a string, so it expects a string to compare to, but the argument is 0. Hence, "must be a Sequence, not a 'Number'."