intitial commitHEADmain

1 files changed, 37 insertions, 0 deletions

diff --git a/src/iterator.zig b/src/iterator.zig
new file mode 100644
index 0000000..920091a
--- /dev/null
+++ b/src/iterator.zig
@@ -0,0 +1,37 @@
+const std = @import("std");
+const iter = @This();
+
+pub fn Iterator(comptime T: type) type {
+    return struct{
+        const Self = @This();
+        items: []const T,
+        index: usize = 0,
+
+        pub fn next(self: *Self) ?T {
+            if (self.empty()) return null;
+            defer self.index += 1;
+            return self.items[self.index];
+        }
+
+        pub fn current(self: Self) ?T {
+            if (self.empty()) return null;
+            return self.items[self.index];
+        }
+
+        inline fn empty(self: Self) bool {
+            if (self.items.len < 1) return true;
+            return false;
+        }
+    };
+}
+
+const t = std.testing;
+
+test "initialize iterator" {
+    var iterator = Iterator(u8){.items = "Hello World!"};
+    for ("Hello World!", 0..) |c,i| {
+        try t.expect(c == iterator.current().?);
+        try t.expect(c == iterator.next().?);
+        try t.expect(c == iterator.items[i]);
+    }
+}