Syntax Error: unexpected Token . when creating a recursive list

Question

function createList(arr) {
     if(!arr.length){
         return {value:arr[0], rest: null};                                                                        
     }
     else {
         return {
             value: arr[0] ,
             rest: {
                 createList(arr.slice(1))
             }
         };
     }
 }

 console.log(arrayToList([1,2,3]));

i'm working off chapter 4 from the eloquent javascript exercises and i can't seem to make this recursive list. It gives me a syntax error that the method "." call is a unexpected token

What's arrayToList? I assume you meant to call createList. — gen_Eric
– gen_Eric, Commented Sep 13, 2016 at 16:44
Also why are you trying to access arr[0] after specifically checking to see if the length is 0? — gen_Eric
– gen_Eric, Commented Sep 13, 2016 at 16:45
I think the errors have already been pointed out, but if you give us the actual error output (including line numbers and stack trace, if available), we can help you a lot better. stackoverflow.com/help/mcve — Daniel Wisehart
– Daniel Wisehart, Commented Sep 13, 2016 at 17:01

gen_Eric · Accepted Answer · 2016-09-13 16:42:36Z

4

rest: {
    createList(arr.slice(1))
}

This is being interpreted as an object, not a block statement. It's looking for a key: value pair and it's not seeing that.

Try:

return {
    value: arr[0],
    rest: createList(arr.slice(1))
};

answered Sep 13, 2016 at 16:42

gen_Eric

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