JS: Set.prototype.size
New in JS2015.
setObj.size-
Return the total count of values in setObj.
(new Set([4, 5, 6])).size === 3
sizeis a getter property. [see Getter Setter Properties]
New in JS2015.
setObj.size(new Set([4, 5, 6])).size === 3
size is a getter property.
[see Getter Setter Properties]