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python/snippets/find.md

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+---
+title: Find matching value
+type: snippet
+tags: [list]
+cover: duck-plants
+dateModified: 2020-11-02T19:27:53+02:00
+---
+
+Finds the value of the first element in the given list that satisfies the provided testing function.
+
+- Use a list comprehension and `next()` to return the first element in `lst` for which `fn` returns `True`.
+
+```py
+def find(lst, fn):
+  return next(x for x in lst if fn(x))
+```
+
+```py
+find([1, 2, 3, 4], lambda n: n % 2 == 1) # 1
+```