Why put a semicolon after the last input for an array?

This is an example from a textbook that I’m working with as a beginner. Why would this have semi colons after the 8.99 and -1.50?

updatePriceTable([19.99, 9.99; 14.99, 8.99;], [-1.00; -1.50;], 1)

NOTE:-

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Suppose that you are writing out several rows of value using code. You write out the initial [ and you start writing values. You reach the end of the first row. You now have three possible strategies:

1. Test to see if you are at the last row, and if not then put in ; — and after you leave the loop, put in the ] and continue with whatever you were doing; OR
2. write out ; anyhow — and after you leave the loop, put in the ] and continue on with whatever you were doing; OR
3. create all of the row-by-row strings in memory, and after you are doing, strjoin() them with ; (which will not put a semi-colon at the end); then put on the ] and write it all out to output, and then continue on

The first strategy requires a last-row test every iteration, which is

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Why put a semicolon after the last input for an array?

Why put a semicolon after the last input for an array?