Function indexOfDiff [src]

Compares two slices and returns the index of the first inequality. Returns null if the slices are equal.

Prototype

pub fn indexOfDiff(comptime T: type, a: []const T, b: []const T) ?usize

Parameters

T: typea: []const Tb: []const T

Example

 test indexOfDiff {
    try testing.expectEqual(indexOfDiff(u8, "one", "one"), null);
    try testing.expectEqual(indexOfDiff(u8, "one two", "one"), 3);
    try testing.expectEqual(indexOfDiff(u8, "one", "one two"), 3);
    try testing.expectEqual(indexOfDiff(u8, "one twx", "one two"), 6);
    try testing.expectEqual(indexOfDiff(u8, "xne", "one"), 0);
}

Source

  pub fn indexOfDiff(comptime T: type, a: []const T, b: []const T) ?usize {
    const shortest = @min(a.len, b.len);
    if (a.ptr == b.ptr)
        return if (a.len == b.len) null else shortest;
    var index: usize = 0;
    while (index < shortest) : (index += 1) if (a[index] != b[index]) return index;
    return if (a.len == b.len) null else shortest;
}  