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Adam Ocasio
1,742 PointsQuestion on why my loop is faulty
So I have a for loop that i was trying out for the extra credit and i don't understand why it turned into an infinite loop, could anyone explain this conundrum?
for (var counter = 0; counter <= 100; counter = counter++) { console.log(counter); }
when i run the above code it runs infinitely, but if I change the "counter++" to "counter + 1" it will print out numbers 1 - 100 as intended. Aren't the two commands the same?
2 Answers
Pierre-Emmanuel Turcotte
13,670 PointsThe problem is with your statement counter = counter++ in the for evaluation.
What is happening is that the increment is happening after the assignment to the counter variable. This is too late for the evaluation.
You can make ++ operator precede the variable to make the increment happen before the assignment. This will fix you code.
This works:
for(counter=0; counter<=100; counter = ++counter){
console.log("This works!");
}
Or you could just forget the assignment operator and just have the counter++ statement which would work as well:
for(counter=0; counter<=100; counter++){
console.log("This works!");
}
Kelly von Borstel
28,880 Pointscounter++ will increment counter -- it assigns the value to counter, so doesn't need the "counter =" to the left. These two statements are equivalent:
counter = counter + 1
counter++