30-seconds-of-code/snippets/pluck.md

title, tags

title	tags
pluck	list,dictionary,intemediary

Extracts a list of values from a dict given a key

• Given an array of dicts, returns the list of values of the key passed from each dict record.
• When a dict does not have the key passed, returns None

def pluck(array, key):
  return list(map(lambda entry: dict.get(entry, key), array))

simpsons = [
  { "name": "lisa", "age": 8 },
  { "name": "homer", "age": 36 },
  { "name": "marge", "age": 34 },
  { "name": "bart", "age": 10 },
];

pluck(simpsons, "age") # [8, 36, 34, 10]