The filter function applies the predicate, and if it returns true, the element in the sequence is added to the result.
filter函数被应用到这个断言,如果该断言返回true,序列中的元素就被加到此结果。
The filter function applies the predicate, and if it returns true, the element in the sequence is added to the result.
filter函数被应用到这个断言,如果该断言返回true,序列中的元素就被加到此结果。
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