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━━━━━━━━━━━━━━━
CHALLENGE 098
Andinus
━━━━━━━━━━━━━━━
2021-02-02
Table of Contents
─────────────────
1. Task 1 - Read N-characters
.. 1. Raku
1 Task 1 - Read N-characters
════════════════════════════
You are given file `$FILE'.
Create subroutine `readN($FILE, $number)' returns the first
n-characters and moves the pointer to the `(n+1)th' character.
1.1 Raku
────────
• Program: <file:raku/ch-1.raku>
`readN' is defined as such:
┌────
│ sub readN (
│ IO $file, Int $chars --> Str
│ ) {
│ ...
│ }
└────
The pointer index is stored in a state array (`%pointers'). It's
stores the pointer separately for each file. It's initialized with 0.
┌────
│ # %pointers stores the pointer index.
│ state Int %pointers;
│ %pointers{$file} = 0 without %pointers{$file};
└────
The pointer is updated & required string is returned.
┌────
│ with %pointers{$file} -> $idx {
│ %pointers{$file} += $chars;
│ return $file.slurp.substr($idx, $chars);
│ }
└────
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