A guide on removing all keys from an object in typescript

Question

A guide on removing all keys from an object in typescript

I am attempting to retrieve the keys from an object of type FilterType

Here is the structure -

export interface FilterType {
  name?: string[];
  status?: string[];
  brand?: string[];
  categoryAndColour?: {
    [category: string]: string[];
  };
  rating?: string[];
}

Here is the object -

const newState: FilterType = { ...state };

I am trying to create a function that eliminates all keys from newState, but I encounter errors when attempting to iterate through the object using map or for..in loops.

This is what I have been working on -

for (var key in newState){
        delete newState[key];
      }
      return newState;

However, I keep receiving the error message

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type

And

No index signature with a parameter of type 'string' was found on type

How can I go about solving this issue?

javascript typescript types javascript-objects react-typescript

Answer 1

Answer №1

To start fresh with an empty state, simply declare the newState as a new object:

const newState: FilterType = {};

If you wish to remove all keys regardless, make sure to specify the type of key before using it in the for..in loop (TS playground):

let key: keyof FilterType;

for (key in newState){
  delete newState[key];
}

Answer 2

To start fresh with an empty state, simply declare the newState as a new object:

const newState: FilterType = {};

If you wish to remove all keys regardless, make sure to specify the type of key before using it in the for..in loop (TS playground):

let key: keyof FilterType;

for (key in newState){
  delete newState[key];
}

Answer 3

Answer №2

Give this a shot:

Object.keys(updatedState).forEach((item) => delete updatedState[item]);

afterwards, when you execute:

console.log(updatedState)

you should see an empty object as the result:

{ }

Answer 4

Give this a shot:

Object.keys(updatedState).forEach((item) => delete updatedState[item]);

afterwards, when you execute:

console.log(updatedState)

you should see an empty object as the result:

{ }

A guide on removing all keys from an object in typescript

Answer №1

Answer №2

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