Course of Raku / Objects, I/O, and exceptions / Input and output / Working with files / Exercises / Save and read

Solution: Save and read

Here is a possible solution to the task.

Code

spurt 'number.txt', "42\n";

my $n = slurp('number.txt').trim.Int;
say $n * 2;

🦋 You can find the source code in the file save-and-read.raku.

Output

84

Comments

1. spurt creates the file and writes the string to it; slurp reads the whole file back into a string. Together they are a complete save-and-load round trip.

2. What comes back from slurp is text — "42\n" — so we trim off the trailing newline and call .Int to turn it into a number before doing arithmetic. The result, 42 * 2, is 84.

3. The program still works without .trim.Int though.

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