Add pluck

snippets/pluck.md

@@ -0,0 +1,25 @@
+---
+title: pluck
+tags: list,dictionary,intemediary
+---
+
+Extracts a list of values from a dict given a key
+
+- Given an `array` of `dict`s, returns the list of values of the `key` passed from each dict record.
+- When a dict does not have the `key` passed, returns `None`
+
+```py
+def pluck(array, key):
+  return list(map(lambda entry: dict.get(entry, key), array))
+```
+
+```py
+simpsons = [
+  { "name": "lisa", "age": 8 },
+  { "name": "homer", "age": 36 },
+  { "name": "marge", "age": 34 },
+  { "name": "bart", "age": 10 },
+];
+
+pluck(simpsons, "age") # [8, 36, 34, 10]
+```