The elems method is in s02 under 'Built-In Data Types'
The section begins with:

To get the number of elements in an array, use the .elems method. You can also ask for the total string length of an array's elements, in bytes, codepoints or graphemes, using these methods .bytes, .codes or .graphs respectively on the array.

In reply to Re: Fathoming Perl6 documentation by lidden
in thread Fathoming Perl6 documentation by John M. Dlugosz

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