Re: perl interpolation

Interpolation occurs between double quotes or qq and is not involved here (and would not affect the outcome if it was).

Placing quotes around characters makes it a text string, and for false we would need an empty string or a single zero: anything else is true. Numeric zero (with no quotes) is false:

use strict;
use warnings;

if ( '00' ) { 
    print "Yes\n"
} 

if ( 00 ) {
    print "Yes\n"
}
else {
    print "No\n"
}
[download]

Gives:

Yes
No
[download]

Update: correction to wording of a false string.

Comment on Re: perl interpolation Select or Download Code

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Re^2: perl interpolation by jwkrahn (Abbot) on Jan 24, 2011 at 12:12 UTC
Interpolation occurs between double quotes or qq Please read perlop carefully, particularly the Quote-Like Operators section where it says: q/STRING/ 'STRING' A single-quoted, literal string. A backslash represents a backslash unless followed by the delimiter or another backslash, in which case the delimiter or backslash is interpolated.	[reply]
Re^3: perl interpolation by ikegami (Patriarch) on Jan 24, 2011 at 16:05 UTC
Seems like a rather poor choice of word to me. The delimiter or backslash is already present in the string literal, so how can it be interpolation?	[reply]
Re^3: perl interpolation by cdarke (Prior) on Jan 26, 2011 at 13:20 UTC
The doc is rather inconsistent, at the start of perlop is the following table: Customary Generic Meaning Interpolates '' q{} Literal no "" qq{} Literal yes `` qx{} Command yes* qw{} Word list no // m{} Pattern match yes* qr{} Pattern yes* s{}{} Substitution yes* tr{}{} Transliteration no (but see below) <<EOF here-doc yes* * unless the delimiter is ''. [download] Note: it says single quotes do not offer interpolation. So, as in most holy books, it depends on which part of perlop you (carefully) read.	[reply] [d/l]