One Swift mistake everyone should stop making today
https://www.hackingwithswift.com/articles/280/one-swift-mistake-everyone-should-stop-making-today
november 2025 ‧ reddit swift imported ‧ open in karakeep
From Reddit saved post — r/swift, u/twostraws, Nov 18 2025
https://www.reddit.com/r/swift/comments/1p0ldk0/one_swift_mistake_everyone_should_stop_making/
The article highlights a common Swift mistake: using the Objective-C method replacingOccurrences(of:with:) instead of Swift's native replacing(_:with:) for string replacement. The former mishandles Unicode, especially emoji like flag characters, leading to unexpected and incorrect string transformations. The issue arises because replacingOccurrences(of:with:) treats Unicode characters as simple substrings, causing bizarre bugs. The simple solution is to use Swift's replacing(_:with:), which correctly respects Unicode and avoids these problems.
TL;DR: You should use replacing(_:with:) rather than replacingOccurrences(of:with:)
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