exercism/zig/pangram/pangram.zig

const ascii = @import("std").ascii;

pub fn isPangram(str: []const u8) bool {
    var alphabet = [_]u8{0} ** 26;

    for (str) |c| {
        if (!ascii.isAlphabetic(c)) {
            continue;
        }
        alphabet[ascii.toLower(c) - 97] += 1;
    }

    for (alphabet) |count| {
        if (count == 0) return false;
    }

    return true;
}