Grouped by First Letter

Here is a more complex GroupedVirtuoso example displaying 200 users, grouped by the first letter of their name. The generateGroupedUsers is a dummy implementation that builds grouped data. The users variable contains 500 user records, The groups variable contains the first letter groups -> ['A', 'B', 'C']. The groupCounts specifies how many items each group has, for example [ 20, 30, 15, 10 ].

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