Initialize an array of 'close' data of a security

Can you help me out?

During AFL coding, how can i initialize an array of 'close' data of a specific security of interest at any particular moment?

My solution: function "foreign"
Is there a better and more appropriate function ???

I remain.

Mike-Ekwueme (respartner)

N.B: i am an AFL coding beginner....

Initialize an array of 'close' data of a security