Re: What is the difference?


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Re: What is the difference?

by zby (Vicar)

on Apr 08, 2003 at 14:29 UTC ( [id://248938]=note: print w/replies, xml )

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in reply to What is the difference?

Look at the output without wc. The += operator does not concatenate the right side to the left. It is the .= operator that does it.

Update Ok - there is no wc in the second example. But once again look at the line with += the left side of it is a list - a list does not return its length in a scalar context (only an array do it).

Update As Abigail-II pointed out split in scalar context returns the number of fields.

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Re: What is the difference?
by Abigail-II (Bishop) on Apr 08, 2003 at 14:38 UTC

You're the second person to assume something needs to be concatenated. Why, I have no idea. split doesn't return a string, it returns a number, and the program is counting things. I see no reason at all to come up with concatenation.

To answer the question, split returns the number of fields. And if you split on [ \t]*, the number of fields isn't necessaryly the same as the number of characters.

Abigail

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Re: Re: What is the difference?
by jasonk (Parson) on Apr 08, 2003 at 14:33 UTC

Look at the command line, the second one doesn't use wc at all, it does the counting itself.