Do I need to delete an object in javascript if I declared it with let?

Question

In javascript if I declare an object with let, do I need to explicitly delete it?

Example:

downloadHelper(url) {
    let pom = document.createElement('a');
    pom.setAttribute('href', url);
    pom.setAttribute('download', '');
    pom.style.display = 'none';
    document.body.appendChild(pom);
    pom.click();
    document.body.removeChild(pom);
    delete pom;
},

No you don't. Moreover, `delete` deletes object properties not variables. — MinusFour, Feb 11 '16 at 20:19
[`delete` throws on variables](http://perfectionkills.com/understanding-delete/) declared with `let`. — Bergi, Feb 11 '16 at 20:47

score 2 · Answer 1 · edited May 23 '17 at 12:15

2

No you don't JavaScript is garbage collected. Delete only deletes the reference not actually object. Following explains all you needed.

Interesting Posts: Deleting Objects in JavaScript

edited May 23 '17 at 12:15

Community

1
1

answered Feb 11 '16 at 20:19

Majeed Siddiqui

548
2
9

score 1 · Accepted Answer · answered Feb 11 '16 at 20:19

1

This stackoverflow article may be of use. The short answer is no. Since the variable is still scoped to something, when that something gets deleted then the variable should get garbage collected, often sooner than a var as well.

answered Feb 11 '16 at 20:19

Ajwhiteway

986
1
9
23

Do I need to delete an object in javascript if I declared it with let?

2 Answers2