add hasp map

Author: ziteh

hash_map/basic.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const allocator = gpa.allocator();
+    var map = std.AutoHashMap(u8, []const u8).init(allocator);
+    defer map.deinit();
+
+    // Insert
+    try map.put(0, "Zero");
+    try map.put(1, "One");
+    try map.put(2, "Two");
+
+    const value = map.get(1);
+    if (value) |v| {
+        print("{s}", .{v});
+    }
+}

hash_map/default.zig

@@ -0,0 +1,19 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const allocator = gpa.allocator();
+    var map = std.AutoHashMap(u8, []const u8).init(allocator);
+    defer map.deinit();
+
+    // Insert
+    try map.put(0, "Zero");
+    try map.put(1, "One");
+    try map.put(2, "Two");
+
+    const value = map.get(99) orelse "Default";
+    print("{s}", .{value});
+}

hash_map/readme.md

@@ -0,0 +1,18 @@
+# Hash Maps
+
+key-value pair
+
+```bash
+$ zig run basic.zig
+One
+```
+
+```bash
+$ zig run default.zig
+Default
+```
+
+```bash
+$ zig run string.zig
+1
+```

hash_map/string.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const allocator = gpa.allocator();
+    var map = std.StringHashMap(u8).init(allocator);
+    defer map.deinit();
+
+    // Insert
+    try map.put("Zero", 0);
+    try map.put("One", 1);
+    try map.put("Two", 2);
+
+    const value = map.get("One");
+    if (value) |v| {
+        print("{}", .{v});
+    }
+}