which one is more efficient between array and linked list.
and one problem to code, given a string of alphanumeric characters find out the character which repeated most.
and gave me a javascript code and I had to find out the output.

Question

which one is more efficient  between array and linked list.
and one problem to code, given a string of alphanumeric characters find out the character which repeated most.
and gave me a javascript code and I had to find out the output.

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