What is the point of an object iterator?

Question

JavaScript

Hello, I'm learning js, I've reached the topic of object iterators. I understand how the code works:

let nam = {
    from: 1,
    to: 5
}

nam[Symbol.iterator] = function(){
    return {
        current: this.from,
        last: this.to,

        next(){
            if(this.current <= this.last){
                return {
                    done:false,
                    value: this.current++
                } 
            }else{
                return {done: true}
            }
        }
    }
}


for(let x of nam){console.log(x)}

but that's what iterators of objects are for, I can't figure it out. learnjavascript explains dryly and with only one example. Perhaps you (experienced comrades) have examples where the iterator is used, then I will be glad to study your code or explanation. Thanks in advance for your attention.