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Re: idea: everything-slices
From: Ed Avis
August 20, 2021 05:16
Re: idea: everything-slices
Message ID: DM4PR11MB52476C78D2D9DAC838B16A019DC09@DM4PR11MB5247.namprd11.prod.outlook.com
A new slice syntax should look closely at what Python does. The start and end are separated by a colon and the range is half-closed, so "start up until end", as commonly used in C-style for-loops and C++ iterators. Either can be omitted and so an "everything slice" is list[:].
I think the half-closed range is more elegant than Perl's .. giving a fully inclusive range, which then requires the $#a syntax to give one less than the length of @a. In Perl I guess it would look something like
@array[:3] # equivalent to @array[0 .. 2]
@array[0:2] # equivalent to @array[0, 1]
@array[:$len] # equivalent to @array[0 .. $len - 1]
@array[:] # equivalent to @array[0 .. $#array]
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