字符串驻留

¥String Interning

有关更多详细信息，请参阅 [hstr][hstr]。

¥See [hstr][] for more details.

如果字符串不太短也不太长，SWC 会驻留它。这对于减少内存使用量和提高性能很有用，因为 SWC 是一种编译器。许多变量共享相同的字符串，我们必须对它们执行大量哈希操作。

¥SWC interns strings if it's not too short nor too long. This is useful for reducing memory usage and improving performance because SWC is a sort of compiler. Many variables share the same string, and we have to perform lots of hash operations on them.

它不会驻留太短的字符串，因为我们可以避免为它们分配空间。它不会驻留太长的字符串，因为这不值得。通常，长字符串彼此并不相同。

¥It does not intern too short strings because we can avoid allocations for them. It does not intern too long strings because it's not worth it. Typically, long strings are not same to each other.

在驻留字符串时，SWC 会计算字符串的哈希值。它使 hash() 变成 O(1)。虽然 eq 严格来说不是 O(1)，但它变得更快。

¥While interning strings, SWC calculates the hash of the string. It makes hash() O(1). eq becomes much faster although it's not strictly O(1).