False
while in many cases a for loop might loop through a preset amount of data the number of iterations can also be stored in a dynamic variable
Preset
for(var i = 0; i < 50; i++){
console.log(i);
}
/*returns
1
2
3
4
5
etc it keeps going until 50
*/
Dynamic
// array size can be changed and still work
var arr = ["a","b","c"];
for(var x = 0; x< arr.length; x++){
console.log(arr[x])
}
/*returns
"a"
"b"
"c"
*/
