Factor

1 files changed, 19 insertions, 0 deletions

diff --git a/html/toys/euler-golf/js/json-ds.js b/html/toys/euler-golf/js/json-ds.js
new file mode 100644
index 0000000..dc7e88e
--- /dev/null
+++ b/html/toys/euler-golf/js/json-ds.js
@@ -0,0 +1,19 @@
+class JSONSet {
+  items = new Set();
+
+  constructor(initial) {
+    if (Array.isArray(initial)) {
+      initial.map((x) => this.apply_set_function("add", x));
+    } else {
+      this.apply_set_function("add", initial);
+    }
+
+    ["add", "has", "remove"].forEach(
+      (f_name) => (this[f_name] = (x) => this.apply_set_function(f_name, x))
+    );
+  }
+
+  apply_set_function(f_name, x) {
+    return this.items[f_name](JSON.stringify(x));
+  }
+}