Array.size() vs Array.length

Question

What is the difference between the two?

So I know that array.size() is a function while array.length is a property. Is there a usecase for

Answer 1

The property 'length' returns the (last_key + 1) for arrays with numeric keys:

var  nums  =  new  Array ();
nums [ 10 ]  =  10 ; 
nums [ 11 ]  =  11 ;
log.info( nums.length );

will print 12!

This will work:

var  nums  =  new  Array ();
nums [ 10 ]  =  10 ; 
nums [ 11 ]  =  11 ;
nums [ 12 ]  =  12 ;
log.info( nums.length + '  /  '+ Object.keys(nums).length );