From a1363905e8383fe217d49347757213f237aa8508 Mon Sep 17 00:00:00 2001
From: RealPeha <real.peha@gmail.com>
Date: Tue, 6 Oct 2020 11:27:49 +0300
Subject: [PATCH] Added circularJSONStringify snippet

---
 snippets/circularJSONStringify.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 snippets/circularJSONStringify.md

diff --git a/snippets/circularJSONStringify.md b/snippets/circularJSONStringify.md
new file mode 100644
index 000000000..d181e018c
--- /dev/null
+++ b/snippets/circularJSONStringify.md
@@ -0,0 +1,30 @@
+---
+title: circularJSONStringify
+tags: object,intermediate
+---
+
+Serializes valid JSON objects containing circular references into a JSON format.
+
+- Use `JSON.stringify` with a custom replacer
+- ⚠️ **NOTICE:** This function finds and removes circular references, what causes data loss
+
+```js
+const circularJSONStringify = object => {
+  const cache = new WeakSet();
+  return JSON.stringify(object, (key, value) => {
+    if (value !== null && typeof value === 'object') {
+      if (cache.has(value)) return;
+
+      cache.add(value);
+    }
+    return value;
+  });
+};
+```
+
+```js
+const obj = { n: 42 };
+obj.obj = obj;
+
+circularJSONStringify(obj); // '{"n": 42}'
+```