With a higher-order function, it's easy.
通过高阶函数,这很容易做到。
PHP's array_filter is an example of what is know in functional programming as a higher-order function.
php的array _ filter是函数式编程语言中高阶函数的一个例子。
The temperature higher-order function returns the value of current, which has either the hot or cold function.
temperature高阶函数返回current的值,而current又可以有hot或cold函数。
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