The debugger statement can be placed anywhere in procedures to suspend execution. Using the debugger statement is similar to setting a breakpoint in the code. By definition such statement must absolutely be removed from the source code to prevent any unexpected behavior or added vulnerability to attacks in production.
for (i = 1; i<5; i++) {
// Print i to the Output window.
Debug.write("loop index is " + i);
// Wait for user to resume.
debugger;
}
for (i = 1; i<5; i++) {
// Print i to the Output window.
Debug.write("loop index is " + i);
}