Course of Raku / Essentials / Strings / String concatenation

Quiz 2: Concatenating strings and numbers

Raku automatically converts a number if you want to concatenate it to a string. In each of the parts below, select the lines that print the required string.

1

Which of the lines print Alpha2?

1	say 'Alpha2';
0	say 'Alpha' 2;	A space is a syntax error here.
1	say 'Alpha', '2';	There is no string concatenation, but the result is correct.
1	say 'Alpha' ~ '2';
1	say 'Alpha' ~ 2;	A number is converted to a string and then concatenated.
0	say 'Alpha' + 2;	A + does not do string concatenation.
0	say 'Alpha' . 2;	Neither does a ..

2

Which of these lines print 123?

1	say 1 ~ 2 ~ 3;	String concatenation here, even for numbers.
0	say 1 + 2 + 3;	A regular arithmetical expression.
1	say '1' ~ '2' ~ '3';	Single characters are also strings.
0	say '1' + '2' + '3';	As there is a +, the strings are converted to numbers.
1	say 1 ~ 23;
1	say 12 ~ 3;
1	say 123 ~ '';	'' is an empty string, so appending it does not change the result.