In the above syntax, the x identifier is used to represent the name of the table which entries we want to sort, and the f identifier is used to represent the order function which is not necessary to provide if you are okay with the default order of sorting. If this function is not provided, sort uses the default less-than operation (corresponding to the `<ยด operator). The order function takes two arguments, and these two arguments must return true if the first argument should come first in the sorted array. This order function is used to provide the logic if we want to sort the elements of the table in a certain order. The sort function also takes one more argument with the table and that argument is a function which is known as the order function. One of the most used functions in Lua is the sort function which is provided by the Lua library which tables a table as an argument and sorts the values that are present inside the table.
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