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+//
+// Let's learn some array basics. Arrays are declared with:
+//
+//   var foo: [3]u32 = [3]u32{ 42, 108, 5423 };
+//
+// When Zig can infer the size of the array, you can use '_' for the
+// size. You can also let Zig infer the type of the value so the
+// declaration is much less verbose.
+//
+//   var foo = [_]u32{ 42, 108, 5423 };
+//
+// Get values of an array using array[index] notation:
+//
+//     const bar = foo[2]; // 5423
+//
+// Set values of an array using array[index] notation:
+//
+//     foo[2] = 16;
+//
+// Get the length of an array using the len property:
+//
+//     const length = foo.len;
+//
+const std = @import("std");
+
+pub fn main() void {
+    // (Problem 1)
+    // This "const" is going to cause a problem later - can you see what it is?
+    // How do we fix it?
+    const some_primes = [_]u8{ 1, 3, 5, 7, 11, 13, 17, 19 };
+
+    // Individual values can be set with '[]' notation.
+    // Example: This line changes the first prime to 2 (which is correct):
+    some_primes[0] = 2;
+
+    // Individual values can also be accessed with '[]' notation.
+    // Example: This line stores the first prime in "first":
+    const first = some_primes[0];
+
+    // (Problem 2)
+    // Looks like we need to complete this expression. Use the example
+    // above to set "fourth" to the fourth element of the some_primes array:
+    const fourth = some_primes[???];
+
+    // (Problem 3)
+    // Use the len property to get the length of the array:
+    const length = some_primes.???;
+
+    std.debug.print("First: {}, Fourth: {}, Length: {}\n", .{
+        first, fourth, length,
+    });
+}