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[SR-7029] on Darwin String.hasPrefix seems to be in the stdlib, on Linux it's not #3734

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weissi opened this issue Feb 19, 2018 · 5 comments
Closed

[SR-7029] on Darwin String.hasPrefix seems to be in the stdlib, on Linux it's not #3734

weissi opened this issue Feb 19, 2018 · 5 comments
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@airspeedswift
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bug Foundation Standard Library

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@weissi
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weissi commented Feb 19, 2018

Previous ID SR-7029
Radar None
Original Reporter @weissi
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Foundation, Standard Library
Labels Bug
Assignee @airspeedswift
Priority Medium

md5: 29ba569747314d2a0051173965e32872

Issue Description:

the following Swift code

print("abc".hasPrefix("a"))

compiled and run on Darwin gives

$ cat test.swift && swiftc -o test test.swift && ./test
print("abc".hasPrefix("a"))
true

but on Linux

$ cat test.swift && swiftc -o test test.swift && ./test
print("abc".hasPrefix("a"))
test.swift:1:7: error: value of type 'String' has no member 'hasPrefix'
print("abc".hasPrefix("a"))
      ^~~~~ ~~~~~~~~~

Swift versions 4.0.2 on both
@belkadan
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I think there was a deliberate reason for this, but I don't remember it. @milseman?

@weissi
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weissi commented Feb 19, 2018

I should probably mention that there's Sequence.starts<S: Sequence>(with: S) where ... which obvs works on String now.

@milseman
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Mannequin

milseman mannequin commented Feb 19, 2018

@airspeedswift was working on this. On Darwin it uses NSString operations.

@airspeedswift
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Right, sequence has starts(with🙂 which is the same thing (albeit slightly slower)

@spevans
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spevans commented Mar 5, 2020

Looks like it was fixed in 4.2

$ ~/swift-4.2-RELEASE-ubuntu18.04/usr/bin/swift
Welcome to Swift version 4.2 (swift-4.2-RELEASE). Type :help for assistance.
  1> print("abc".hasPrefix("a")) 
true

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
This issue was closed.
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@weissi @belkadan @spevans @airspeedswift