Find nth position in a GlideRecord query

Hi All,

Can someone please help me out to find out a way to find the nth position of a glide record when a table is queried?

My use case is that I need to query a table from a client script, find its nth position, say 1st record and 5th record and update these values to another table using the same client script?

Can this be done using client script or is there a better way I can use?