Rename deepGetter to deepGet

snippets/deepGet.md

@@ -0,0 +1,24 @@
+### deepGet
+
+Returns the target value in a nested JSON object, based on the keys array.
+
+Contrust the keys you want in the nested JSON object as an `Array`.
+Use `Array.prototype.reduce()` to get value from nested JSON object one by one. if the key exists in object, return target value, otherwise, return null.
+
+```js
+const deepGet = (obj, keys) => keys.reduce((xs, x) => (xs && xs[x]) ? xs[x] : null, obj)
+```
+
+```js
+let idx = 2; // or variable from other places
+const data = {
+  foo: {
+    foz: [1, 2, 3],
+    bar: {
+      baz: ['a', 'b', 'c']
+    }
+  }
+};
+deepGet(data, ['foo', 'foz', idx]); // get 3
+deepGet(data, ['foo', 'bar', 'baz', 8, 'foz']); // null
+```