Zig 0.17.0-dev (Split by item)

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findDiff

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

mem.findDiff

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

File

lib/std/mem.zig:852

Code

pub fn findDiff(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;
}