Question

85

JavaScript: Invalid destructuring target

rated 0 times [ 88] [ 3] / answers: 1 / hits: 27096 / 8 Years ago, sun, february 7, 2016, 12:00:00

Here is the code:

 function BinarySearchNode(key) {

     let node = {};

     node.key = key;

     node.lft = null;

     node.rgt = null;



     node.log = () => {

         console.log(node.key);

     }



     node.get_node_with_parent = (key) => {

         let parent = null;



         while (this) {

             if (key == this.key) {

                 return [this, parent];

             }



             if (key < this.key) {

                 [this, parent] = [this.lft, this];

             } else {

                 [this, parent] = [this.rgt, this];

             }

         }



         return [null, parent];

     }



     return node;

 }

My Firefox is 44.0 and it throws a SyntaxError for these lines:

if (key < this.key) {

    [this, parent] = [this.lft, this];

} else {

I tried to understand what exactly is wrong here by reading this blogpost and the MDN. Unfortuntely, I am still missing it :(

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pranavrorys

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answered 8 Years ago levidaylonj · Accepted Answer

this is not a variable, but a keyword and cannot be assigned to. Use a variable instead:

node.get_node_with_parent = function(key) {

    let parent = null;

    let cur = this; // if you use an arrow function, you'll need `node` instead of `this`

    while (cur) {

        if (key == cur.key) {

            return [cur, parent];

        }

        if (key < cur.key) {

            [cur, parent] = [cur.lft, cur];

        } else {

            [cur, parent] = [cur.rgt, cur];

        }

    }

    return [null, parent];

}