Re: contains booboo

[ToddAndMargo via perl6-users]

Le mer. 19 déc. 2018 à 08:57, ToddAndMargo via perl6-users <perl6-us...@perl.org <mailto:perl6-us...@perl.org>> a écrit :

     >> On Tue, Dec 18, 2018 at 10:49 PM ToddAndMargo via perl6-users
     >> <perl6-us...@perl.org <mailto:perl6-us...@perl.org>
    <mailto:perl6-us...@perl.org <mailto:perl6-us...@perl.org>>> wrote:
     >>
     >>     Hi All,
     >>
     >>     Where is my booboo?
     >>
     >>     $ p6 'my$x="abcd"; if $x.contains("b" && not "q") {say
    "y"}else{say
     >>     "n"};'
     >>
     >>     n
     >>
     >>
     >>     In the mean time, I will ue
     >>           if $x.contains("b") && not $x.contains( "q" )
     >>
     >>
     >>     Many thanks,
     >>     -T

    On 12/18/18 4:13 PM, Ralph Mellor wrote:
     > .contains tests whether its invocant, treated as a string,
    contains its
     > argument, treated as a string.
     >
     > The argument you've given to .contains is:
     >
     > "b" && not "q".
     >
     > That's not a string.
     >
     > Here's one option:
     >
     > my$x="abcd"; if $x.contains("b") && not $x.contains("q") {say
     > "y"}else{say "n"};
     >

    Hi Ralph,

    That was my work around.

    The reason I asked the question was the following:

    $ p6 'my$x="abcd"; if $x.contains("b" & "d") {say "y"}else{say "n"};'
    y

    $ p6 'my$x="abcd"; if $x.contains("b" & "e") {say "y"}else{say "n"};'
    n

    So it seemed to me that the following should also work, which
    it does not:

    Should be "y"
    $ p6 'my$x="abcd"; if $x.contains("b" & not "e") {say "y"}else{say
    "n"};'
    n

    Should be "n" and it is
    $ p6 'my$x="abcd"; if $x.contains("b" & not "d") {say "y"}else{say
    "n"};'
    n


    I think maybe I am pushing the limits.  Perl has 101 way of
    doing everything.  It think I am pushing 102.

    -T

On 12/19/18 12:37 AM, Laurent Rosenfeld via perl6-users wrote:

Hi Todd,

first, please don't mix up the && Boolean operator and infix &, an /all/ junction operator.

Also consider the difference between the following code snippets:

my$x="abcd"; if $x.contains(not "e") {say "y"}else{say "n"};

n

my$x="abcd"; if $x.contains(none "e") {say "y"}else{say "n"};

y

Or between these:

my$x="abcd"; if $x.contains("b" & (not "d")) {say "y"}else{say "n"};

n

my$x="abcd"; if $x.contains("b" & (none "e")) {say "y"}else{say "n"};

y

HTH, Laurent.

"none" sweet.  I did not know I could do that.  Thank you!
Got to get my "not"'s straightened out too.