node.js - Cannot delete object property in Javascript - Stack Overflow

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obj = {a: []}

I want to delete obj.a. This code works

if(!obj.a.length)
    delete obj.a //work

This is not

function _delete(o) {
    if(!o.length)
      delete o 
}

_delete(obj.a) //not work

Any way to make it works?

obj = {a: []}

I want to delete obj.a. This code works

if(!obj.a.length)
    delete obj.a //work

This is not

function _delete(o) {
    if(!o.length)
      delete o 
}

_delete(obj.a) //not work

Any way to make it works?

• javascript
• node.js
• object

Share Improve this question Follow asked Jul 3, 2018 at 22:25 LuviasLuvias 57022 gold badges77 silver badges2121 bronze badges 0

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1 Answer 1

Sorted by: Reset to default 8

You can't delete [], which is all that you pass to the function.

You can create a function like

function _delete(obj, prop) {
    if (obj[prop] && ! obj[prop].length) delete obj[prop];
}

and call it with

_delete(obj, 'a');

I'd also add a check for what the property is, and if it exists at all. As you seem to target an array, add a check if it's an array that gets passed:

function _delete(obj, prop) {
    if (Array.isArray(obj[prop]) && ! obj[prop].length) delete obj[prop];
}

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