How to clear current position for Iterable object when using next()?

Question

How can I clear the current position after the for loop or after I used .next() method ?

 const arr = [1,4,2];
 for(v of arr){
     // console.log(v); // 1 4 2
 }
 //  console.log(arr.next())  //arr.next is not a function

 /*
 * 
 * Why? because it is an iterable not an iterator,
 * and to be able to use .next we need to call the iterator method 
 * this iterable’s Symbol.iterator returns:
 * */
 const iter = arr[Symbol.iterator]();

 console.log(iter.next());
 console.log(iter.next());
 console.log(iter.next());
 console.log(iter.next());

After this I want get 1 value from item.

How to do this ?

This example is from http://blog.dubizzle.com/boilerroom/2017/01/09/introduction-javascript-iterables-iterators-generators/

What do you mean by _"clear current position"_? – a better oliver Feb 23 '17 at 09:01 — a better oliver, Feb 23 '17 at 09:01
do you like to get the values ad infinitum? – Nina Scholz Feb 23 '17 at 09:09 — Nina Scholz, Feb 23 '17 at 09:09

score 1 · Answer 1 · edited May 23 '17 at 12:25

1

There's no way to 'clear the current position' per se. However, helpful alternatives were suggested in this answer: Is it possible to reset an ECMAScript 6 generator to its initial state?.

edited May 23 '17 at 12:25

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answered Feb 23 '17 at 09:09

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Iterator.return is not a function – zloctb Feb 23 '17 at 09:10

How to clear current position for Iterable object when using next()?

1 Answers1