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snippets/js/s/dig.md

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+---
+title: Get nested value in object
+type: snippet
+language: javascript
+tags: [object,recursion]
+cover: brown-bird
+dateModified: 2020-10-19T18:51:03+03:00
+---
+
+Gets the target value in a nested JSON object, based on the given key.
+
+- Use the `in` operator to check if `target` exists in `obj`.
+- If found, return the value of `obj[target]`.
+- Otherwise use `Object.values()` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.
+
+```js
+const dig = (obj, target) =>
+  target in obj
+    ? obj[target]
+    : Object.values(obj).reduce((acc, val) => {
+        if (acc !== undefined) return acc;
+        if (typeof val === 'object') return dig(val, target);
+      }, undefined);
+```
+
+```js
+const data = {
+  level1: {
+    level2: {
+      level3: 'some data'
+    }
+  }
+};
+dig(data, 'level3'); // 'some data'
+dig(data, 'level4'); // undefined
+```