StrDistance objects are used to represent the return of the string transformation operator.

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say (($ = "fold") ~~ tr/old/new/).^name;  # OUTPUT: «StrDistance␤»

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A StrDistance object will stringify to the resulting string after the transformation, and will numify to the distance between the two strings.

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my $str = "fold";
my $str-dist = ($str ~~ tr/old/new/);
say ~$str-dist;  # OUTPUT: «fnew␤»
say +$str-dist;  # OUTPUT: «3␤»

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Methods §

method before §

This is actually a class attribute, and called as a method returns the string before the transformation:

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say $str-dist.before; # OUTPUT: «fold␤»

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Also a class attribute, returns the string after the transformation:

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say $str-dist.after;  # OUTPUT: «fnew␤»

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Returns True if before is different from after.

Returns the distance as a number.

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multi method Int(StrDistance:D:)

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Returns the distance between the string before and after the transformation.

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multi method Str(StrDistance:D: --> Str)

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Returns an after string value.

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my $str-dist = ($str ~~ tr/old/new/);
say $str-dist.Str; # OUTPUT: «fnew␤»
say ~$str-dist;    # OUTPUT: «fnew␤»

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