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python/snippets/get.md

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+---
+title: Get nested value
+type: snippet
+tags: [dictionary,list]
+cover: digital-nomad-2
+dateModified: 2020-10-28T12:21:39+02:00
+---
+
+Retrieves the value of the nested key indicated by the given selector list from a dictionary or list.
+
+- Use `functools.reduce()` to iterate over the `selectors` list.
+- Apply `operator.getitem()` for each key in `selectors`, retrieving the value to be used as the iteratee for the next iteration.
+
+```py
+from functools import reduce
+from operator import getitem
+
+def get(d, selectors):
+  return reduce(getitem, selectors, d)
+```
+
+```py
+users = {
+  'freddy': {
+    'name': {
+      'first': 'fred',
+      'last': 'smith'
+    },
+    'postIds': [1, 2, 3]
+  }
+}
+get(users, ['freddy', 'name', 'last']) # 'smith'
+get(users, ['freddy', 'postIds', 1]) # 2
+```