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snippets/max-by.md

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+---
+title: Max list value based on function
+tags: math,list
+cover: digital-nomad-3
+firstSeen: 2019-08-20T15:42:41+03:00
+lastUpdated: 2020-11-02T19:28:27+02:00
+---
+
+Returns the maximum value of a list, after mapping each element to a value using the provided function.
+
+- Use `map()` with `fn` to map each element to a value using the provided function.
+- Use `max()` to return the maximum value.
+
+```py
+def max_by(lst, fn):
+  return max(map(fn, lst))
+```
+
+```py
+max_by([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], lambda v : v['n']) # 8
+```