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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
// Reverses a slice of bytes in place.
export fn reverse(b: []u8) void = {
for (let i = 0z; i < len(b) / 2; i += 1) {
let x = b[i];
b[i] = b[len(b) - i - 1];
b[len(b) - i - 1] = x;
};
};
@test fn reverse() void = {
let b: [4]u8 = [1, 3, 3, 7];
reverse(b);
assert(equal(b, [7, 3, 3, 1]));
let b: [5]u8 = [1, 2, 3, 4, 5];
reverse(b);
assert(equal(b, [5, 4, 3, 2, 1]));
let b: [1]u8 = [1];
reverse(b);
assert(equal(b, [1]));
let b: []u8 = [];
reverse(b);
assert(equal(b, []));
};
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