size() -> Number

Returns the size of the enumeration.


$R(1, 10).size()
// -> 10

['hello', 42, true].size()
// -> 3

// -> 0

Performance considerations

This method exists solely to provide a generic size-getting behavior for all objects enumerable. The default implementation actually performs the loop, which means it has exact linear complexity. Most objects that mix in Enumerable will try to optimize this by redefining their own version of size; this is, for instance, the case of Array, which redefines size to delegate to arrays’ native length property.