Manual char string search pattern

[kornelski]

What it does

Uses of Pattern (in methods like str.split(), str.replace(), str.trim_matches()) where the pattern is a closure matching chars:

str.split(|c: char| c == '\n' || c == 'X') // or
str.split(|c: char| matches!(c, '\n' | 'X'))

can be expressed more succinctly as:

str.split(['\n', 'X'])

and a single-char comparison can be simplified further.

Advantage

It makes the code much shorter, and the character set much easier to read.

They all have about the same performance, except a single-char pattern is much faster than the other forms.

Drawbacks

No response

Example

sentence.trim_end_matches(|c: char| c == '.' || c == '!' || c == '?')

Could be written as:

sentence.trim_end_matches(['.', '!', '?'])

[CBSpeir]

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[Vrajs16]

@rustbot claim

[AurelienFT]

Hello @Vrajs16,
Are you still working on this ?
I would love to start contributing to clippy and this is an issue that interest me :)

[Vrajs16]

@AurelienFT you can claim it

[AurelienFT]

@rustbot claim