Web Reference: You can perform many string operations on a substring. Here, we find the length of the first sentence and create an uppercase version. Strings got a pretty big overhaul in Swift 4. When you get some substring from a String now, you get a Substring type back rather than a String. Why is this? Strings are value types in Swift. That means if you use one String to make a new one, then it has to be copied over. Substrings in Swift have most of the same methods as strings, which means you can work with substrings the same way you work with strings. However, unlike strings, you use substrings for only a short amount of time while performing actions on a string.
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Swift 4 String Substring Guide Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 8, 2026
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