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[SR-7480] why can't I assign into a String indexed by range? #50023

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mattneub opened this issue Apr 19, 2018 · 2 comments
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[SR-7480] why can't I assign into a String indexed by range? #50023

mattneub opened this issue Apr 19, 2018 · 2 comments
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improvement standard library Area: Standard library umbrella

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@mattneub
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Previous ID SR-7480
Radar None
Original Reporter @mattneub
Type Improvement
Status Resolved
Resolution Invalid
Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Improvement
Assignee None
Priority Medium

md5: 7e17cffb2443123995e2d50d13dd0fb6

Issue Description:

Is there some really good reason why I can't say (s and s2 are strings, r is a range on String.Index):

 s[r] = s2

Of course I know I can say

 s.replaceSubrange(r, with: s2)

But I feel I shouldn't have to.
@belkadan
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Subscript assignment is supposed to be something that can be completed in time proportional to the size of the range being replaced. But that isn't generally true with a String, because even if two Strings are the same length (in terms of Characters) their stored representations might not match up.

@mattneub
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Fascinating, thanks.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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improvement standard library Area: Standard library umbrella
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@belkadan @mattneub