JS needs a modulo operator. It currently has the remainder operator `%`
which works in most cases except for negative values. I believe the the
`%%` would work great and be easy to remember.

let x = (-13) %% 64;
is equivalent to
let x = ((-13 % 64) + 64) % 64;
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JS needs a modulo operator. It currently has the remainder operator `%`
which works in most cases except for negative values. I believe 
`%%` would work great and be easy to remember.

let x = (-13) %% 64;

is equivalent to

let x = ((-13 % 64) + 64) % 64;

JS needs a modulo operator. It currently has the remainder operator `%`
which works in most cases except for negative values. I believe the the
`%%` would work great and be easy to remember.

let x = (-13) %% 64;

is equivalent to

let x = ((-13 % 64) + 64) % 64;