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Re^2: Equality operators

by jkva (Chaplain)
on Apr 25, 2006 at 11:41 UTC ( #545538=note: print w/replies, xml ) Need Help??

in reply to Re: Equality operators
in thread Equality operators

Mantadin, thank you. I am aware of this, however I am wondering why '1' == '1foo' evals to true while '1' eq 'foo1' does not.

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Re^3: Equality operators
by davorg (Chancellor) on Apr 25, 2006 at 11:44 UTC

    When converting strings to numbers, Perl only looks at the start of the string. '1foo' becomes 1 and 'foo1' becomes 0.


    "The first rule of Perl club is you do not talk about Perl club."
    -- Chip Salzenberg

Re^3: Equality operators
by salva (Abbot) on Apr 25, 2006 at 11:46 UTC
    because strings are automatically converted to numbers when needed. '1foo' is converted to 1 and 'foo1' is converted to 0.
Re^3: Equality operators
by ikegami (Pope) on Apr 25, 2006 at 14:44 UTC

    Others have already explained how the conversion works, but if you want to see for yourself the number into which a string is coerced, add 0 to the string.

    print(0+'a', "\n"); # 0 print(0+'b', "\n"); # 0 print(0+'1', "\n"); # 1 print(0+'2', "\n"); # 2 print(0+'1foo', "\n"); # 1 print(0+'foo1', "\n"); # 0