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Remove Characters from the end of a String Scala

Answer 1

+1 A:

string.reverse.substring(1).reverse

That's basically chop, right? If you're longing for a chop method, why not write your own StringUtils library and include it in your projects until you find a suitable, more generic replacement?

Hey, look, it's in commons.

Apache Commons StringUtils.

Stefan Kendall 2009-11-30 21:30:18

It sure is Stefan. I was hoping for a method that when you look at the code, you understand what is going on :) What I'm saying is: For something as simple as "remove last character from string" reverse.substring(1).reverse is misleading. Thanks for the reply

Brian Heylin 2009-11-30 21:39:55

Plus you'd need to wrap the string into a StringBuilder to get a reverse method.

Fabian Steeg 2009-11-30 21:51:47

The first part was mostly a joke :P. Any Java programmer looking at your Scala should be familiar with StringUtils, or at least know of the Apache Commons library to see the import and not be offended. Commons is useful, and it should be used where possible. I've found that most projects include commons at some point, so there's generally no expense to using the library.You could even alias StringUtils as su in your scala programs and refer to it as su.chop(str), which is pretty succinct and not as sucky as using substring.

Stefan Kendall 2009-11-30 22:06:04

Too bad an implicit for StringUtils would be a lot of work. Just shows the mismatch between the way Scala users and Java users think about extension methods.

Ken Bloom 2009-12-01 00:59:00

import org.apache.commons.blah.{StringUtils => su} is a lot of work? Ideally, you'd be deploying to an environment with these libraries already established, as I've said.

Stefan Kendall 2009-12-01 02:51:29

Answer 2

+6 A:

How about using dropRight, which works in 2.8:-

"abc!".dropRight(1)

Which produces "abc"

Don Mackenzie 2009-11-30 22:09:15

The most terse I can come up with for 2.7 is "abc!".split(".$)(0)

Don Mackenzie 2009-11-30 22:34:25

Oops I mean "abc!".split(".$")(0)

Don Mackenzie 2009-11-30 22:35:40

Excellent Thanks Don, I'll have to upgrade to 2.8 :)

Brian Heylin 2009-12-01 07:46:56

Answer 3

+2 A:

val str = "Hello world!"
str take (str.length - 1) mkString

David Winslow 2009-11-30 22:09:50

Answer 4

+1 A:

string.init // padding for the minimum 15 characters

Walter Chang 2009-12-01 03:10:51

Thanks Walter, that's exactly the method I thought Scala would have. Again all these nice methods are 2.8 only, so upgrade here I come :)

Brian Heylin 2009-12-01 07:53:57

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Remove Characters from the end of a String Scala

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