Mastering Functional Programming

Example – nested loop

It's pretty hard to get such a simple example wrong, but consider a nested loop. For example, you have a matrix, and you want to output it to the console. This can be done with a nested loop. You have a loop to iterate on with every entry of the 2D array. Another loop nested in that loop examines the row the outer loop is currently working on. It iterates on every element of that row and prints it to the console.

It is also possible to express these in terms of the go-to statement. So, you will have the first label to signify the entry point into the large loop, another label to signify the entry point to the small loop, and you will call the go-to statement at the end of each loop to jump to the beginning of the respective ...