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The Comprehensive ARIA Development Suite
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F u n c t i o n : i s N u m b e r ( o b j e c t )
S h o r t h a n d : i s N u m ( o b j e c t )
D e s c r i p t i o n : C h e c k s i f a n o b j e c t i s a v a l i d n u m b e r .
R e t u r n s : T r u e i f y e s , F a l s e o t h e r w i s e .
E x a m p l e :
/ / C h e c k i f a n o b j e c t i s a v a l i d n u m b e r
v a r c o n f i r m e d = $ A . i s N u m b e r ( o b j e c t ) ;