From 2de8a8c54d7090dd063bed8b6b283c2fcb452e43 Mon Sep 17 00:00:00 2001
From: Dave Gauer <dave@ratfactor.com>
Date: Sat, 30 Jan 2021 20:00:32 -0500
Subject: Added ex 21-26 for error handling

---
 23_errors3.zig | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 23_errors3.zig

(limited to '23_errors3.zig')

diff --git a/23_errors3.zig b/23_errors3.zig
new file mode 100644
index 0000000..6060bf1
--- /dev/null
+++ b/23_errors3.zig
@@ -0,0 +1,28 @@
+//
+// One way to deal with error unions is to "catch" any error and
+// replace it with a default value.
+//
+//     foo = canFail() catch 6;
+//
+// If canFail() fails, foo will equal 6.
+//
+const std = @import("std");
+
+const MyNumberError = error{ TooSmall };
+
+pub fn main() void {
+    var a: u32 = addTwenty(44) catch 22;
+    var b: u32 = addTwenty(4)  ???   22;
+
+    std.debug.print("a={}, b={}", .{a,b});
+}
+
+// Please provide the return type from this function.
+// Hint: it'll be an error union.
+fn addTwenty(n: u32) ??? {
+    if (n < 5) {
+        return MyNumberError.TooSmall;
+    } else {
+        return n + 20;
+    }
+}
-- 
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