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Swift 4 ÏÖÒÑÕýʽ·¢²¼£¡Swift 4 ÔÚ Swift 3 µÄ»ù´¡ÉÏ£¬ÌṩÁ˸üÇ¿´óµÄÎȽ¡ÐÔºÍÎȶ¨ÐÔ£¬Îª Swift 3 ÌṩԴÂë¼æÈÝÐÔ£¬¶Ô±ê×¼¿â½øÐиĽø£¬²¢Ìí¼ÓÁ˹鵵ºÍÐòÁл¯µÈ¹¦ÄÜ¡£

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Swift 4 °üº¬Ò»¸ö¸ü¿ì¡¢¸üÒ×ʹÓÃµÄ String ʵÏÖ£¬±£ÁôÁË Unicode µÄÕýÈ·ÐÔ£¬²¢ÐÂÔöÁ˶Դ´½¨¡¢Ê¹Óú͹ÜÀí×Ó×Ö·û´®µÄÖ§³Ö¡£

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SE-0163 String Revision: Collection Conformance, C Interop, Transcoding

SE-0168 Multi-Line String Literals

SE-0178 Add unicodeScalars property to Character

SE-0180 String Index Overhaul

SE-0182 String Newline Escaping

SE-0183 Substring performance affordances

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SE-0148 Generic Subscripts

SE-0154 Provide Custom Collections for Dictionary Keys and Values

SE-0165 Dictionary & Set Enhancements

SE-0172 One-sided Ranges

SE-0173 Add MutableCollection.swapAt(_:_:)

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Swift 4 Ö§³Ö½á¹¹»¯ºÍö¾ÙÀàÐ͵Ĺ鵵£¬²¢¿ÉÒÔ¶ÔÍⲿ¸ñʽ£¨Èç JSON ºÍ plist £©½øÐÐÀàÐͰ²È«µÄÐòÁл¯¡£

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SE-0166 Swift Archival & Serialization

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SE-0104 Protocol-oriented integers

SE-0142 Permit where clauses to constrain associated types

SE-0156 Class and Subtype existentials

SE-0160 Limiting @objc inference

SE-0164 Remove final support in protocol extensions

SE-0169 Improve Interaction Between private Declarations and Extensions

SE-0170 NSNumber bridging and Numeric types

SE-0171 Reduce with inout

SE-0176 Enforce Exclusive Access to Memory

SE-0179 Swift run Command

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Migrating to Swift 4

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Swift 4 Ϊ Swift Package Manager ÒýÈëÁËÐµĹ¤×÷Á÷¹¦Äܺ͸üÍêÕûµÄ API £º

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