Why is the initializer of for loop enclosed in square brackets?

Question

for (let i=0; i<select.options.length; i++) {
    if(selectObject.options[i].selected) {
        numberSelected++
    }
}

Is it necesarry to put a square brackets to access the initializer in the loop?

Answer 1

Yes, Cleaner and less error-prone code (just like you ask) exists.

const optionsIterator = select.options.values();

for (const oneOption of optionsIterator) {
    if(oneOption.selected) {
        numberSelected ++
    }
}