filter（抽出,where）

Python

py

filter(func, items)
[x for x in items if func(x)]

py

items = [1, 2, 3, 4, 5]

filter(lambda x : x < 3, items)        # => [1, 2]
[x for x in [1, 2, 3, 4, 5] if x < 3]  # => [1, 2]

Swift

swift

items.filter(Closure)

PHP

php

array_filter($arr1, 'strlen');