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Re: eq vs. ==

by liz (Monsignor)
on Jul 20, 2003 at 10:32 UTC ( #276023=note: print w/replies, xml ) Need Help??


in reply to eq vs. ==

Maybe this answers your question:

$val eq '2'
String compare string value of $val with string '2'.

$val == '2'
Convert string '2' to number, and numerically compare with numeric value of $val

$val == 2
Compare numeric 2 with numeric value of $val

If a string starts with a number, its numeric value will be that number. Consider the following examples:

$ perl -e "print 'a' == 'b'"
True because 0 == 0

$ perl -e "print 'a' == '1b'"
Not true because 0 != 1

$ perl -e "print 'a' == 'b1'"
True because 0 == 0

Liz

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[james28909]: ill be back with a solution eventually
[stevieb]: it's a reminder to re-inforce it :P
[atcroft]: james28909: That particular questions was a bit of trick, actually (depending on the country you are in). More interesting is, if you are trying to subtract from an epoch time, for instance, you might have to consider when/if DST occurs for a location,
[atcroft]: because you may have to adjust the number of seconds you change from an epoch from 86400 (not to mention leap seconds)....
[atcroft]: james28909: Although if your program is using a database, you might be able to "pass the buck" to the database and ask it to do the date change for you....

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