@main[]

^show[^array::create[$void]]

$a[^array::create[]]

$a.05[a5] $a.20[a20] $a.10[a30] $a.25[$void]

1. ^a.count[] elements, ^show[$a]

2. $h[^hash::create[$a]] ^show[$h]

3. $h[ $.05[h05] $.10[h10] $.1[h1] ]
   $tmp[^hash::create[$h]] ^tmp.add[$a] ^show[$tmp]

4. ^show[^h.union[$a]]

5. ^show[^h.intersection[$a]]

6. $a[^array::create[^o::create[]]]
   ^show[$a]

@show[v]
^json:string[$v; $.array[object] ]

@CLASS
o

@create[]
$1[v1]
$3[v3]