CODEWITHSUNDEEP
javascriptobject
MatDepInfo
MatDepInfo

Reputation: 337

How to delete dynamic property of an object?

I try to delete an dynamic property of an object. The problem is that the property is depending of an array of keys. Lets see the code :

let keys = ['23', 'test', '12']; // Example but this is dynamic
let temp = this.array;
keys.forEach(k => {
  temp = temp[k];
});
delete temp;

I want to delete this.array['23']['test']['12']. But I got an error : 'delete cannot be called on an identifier in strict mode'. How to do that ?

Upvotes: 1

Views: 1520

Answers (2)

mbojko
mbojko

Reputation: 14679

I want to delete this.array['23']['test']['12']

Writing just that, delete this.array['23']['test']['12'], will work. But with your syntax, delete temp, you aren't deleting a property, you're trying to delete a variable. That won't fly. Even in the non-strict mode it won't alter the this.array object, you'd be simply declaring a variable and undeclaring it.

With your loop, you should stop one step earlier to delete a property, not a variable:

keys.forEach((key, index, arr) => {
  if (index < arr.length - 1) { 
    temp = temp[key];
  } else {
    delete temp[key];
  }
});

Upvotes: 4

David Klinge
David Klinge

Reputation: 360

You may not be able to delete it but you can set it to null. Try:

temp = null;

Upvotes: 0

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