count, _count. Number of hash keys

^hash._count[]
^hash.count[]
   [3.4.4]

The method returns number of hash keys.

Example
Code…

$man[
   $.name[
Jack]
   $.age[
22]
   $.sex[
m]
]
^man.count[]

…will return:
3

When used in mathematical expressions, numerical value of hash is equal to its keys' number:

^if($man > 2){greater}


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