Tips for clearing object values without deleting the keys: Resetting the values of an object and its

Question

Tips for clearing object values without deleting the keys: Resetting the values of an object and its

Upon creating a service to share data among multiple components, it became necessary to reset the object values once the process was complete. To achieve this, I attempted the following: this.UserDetails = {}; This successfully cleared the values and removed any nested objects, effectively resetting the service object to its default state.

Many thanks.

Below is my service file:

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class dataService {
  constructor() { }
  UserDetails: any = {
    key1 : '' ,
    key2: {
      Status: false,
      Label: ''
    },
    key3: {
      Status: false,
      Label: ''
    },
    key4: {
      Status: false,
      Label: ''
    },
    key5: '',
    key6: '',
    key7: new Date(),

  }
}

After assigning values in components, the UserDetails object appears as follows:

UserDetails = {
    key1 : 'value 1' ,
    key2: {
      Status: true,
      Label: 'label 1'
    },
    key3: {
      Status: false,
      Label: 'label 2'
    },
    key4: {
      Status: true,
      Label: 'label 3'
    },
    key5: 'key value 1',
    key6: 'key value 2',
    key7: new Date(),

  }
}

Once the data is passed to the backend, it is necessary to reset to the default values in the service file.

javascript angular typescript object angular6

Answer 1

Answer №1

Consider creating a class called UserDetails and filling it with data. When resetting, simply return a new instance of this class.

Take a look at the code snippet below for a demonstration. I have used ES6 classes in this example, but you can adapt it for Angular as well.

class UserDetails {
    key1 = '';
    key2 = {
      Status: false,
      Label: ''
    };
    key3 = {
      Status: false,
      Label: ''
    };
    key4 = {
      Status: false,
      Label: ''
    };
    key5 = '';
    key6 = '';
    key7 = new Date();
}
class MyService {
 userDetails;
 constructor(){
   this.userDetails = new UserDetails();
 }
 populate(){
  this.userDetails.key1 ="foo"
  this.userDetails.key2 = {
      Status: true,
      Label: 'bar'
  };
  return this.userDetails;
 }
 reset(){
  this.userDetails = new UserDetails();
  return this.userDetails;
 }
}
let service = new MyService();
console.log(service.populate());
console.log("***********Resetting************");
console.log(service.reset());

Answer 2

Consider creating a class called UserDetails and filling it with data. When resetting, simply return a new instance of this class.

Take a look at the code snippet below for a demonstration. I have used ES6 classes in this example, but you can adapt it for Angular as well.

class UserDetails {
    key1 = '';
    key2 = {
      Status: false,
      Label: ''
    };
    key3 = {
      Status: false,
      Label: ''
    };
    key4 = {
      Status: false,
      Label: ''
    };
    key5 = '';
    key6 = '';
    key7 = new Date();
}
class MyService {
 userDetails;
 constructor(){
   this.userDetails = new UserDetails();
 }
 populate(){
  this.userDetails.key1 ="foo"
  this.userDetails.key2 = {
      Status: true,
      Label: 'bar'
  };
  return this.userDetails;
 }
 reset(){
  this.userDetails = new UserDetails();
  return this.userDetails;
 }
}
let service = new MyService();
console.log(service.populate());
console.log("***********Resetting************");
console.log(service.reset());

Answer 3

Answer №2

Here is a simple solution that may fit your needs. You can iterate through each key in the UserDetails object and delete the key if its value is not an object:

var UserDetails = {
  key1: '',
  key2: {
    Status: false,
    Label: ''
  },
  key3: {
    Status: false,
    Label: ''
  },
  key4: {
    Status: false,
    Label: ''
  },
  key5: '',
  key6: '',
  key7: new Date(),
};

Object.entries(UserDetails).forEach(([key, value]) => {
  if (typeof value !== "object") {
    delete UserDetails[key];
  }
});

console.log(UserDetails);

Answer 4

Here is a simple solution that may fit your needs. You can iterate through each key in the UserDetails object and delete the key if its value is not an object:

var UserDetails = {
  key1: '',
  key2: {
    Status: false,
    Label: ''
  },
  key3: {
    Status: false,
    Label: ''
  },
  key4: {
    Status: false,
    Label: ''
  },
  key5: '',
  key6: '',
  key7: new Date(),
};

Object.entries(UserDetails).forEach(([key, value]) => {
  if (typeof value !== "object") {
    delete UserDetails[key];
  }
});

console.log(UserDetails);

Answer 5

Answer №3

To simplify this task, you can utilize the reduce function. Simply set the keys with non-object values or instances of Date to an empty string.

const input = {
    key1 : '' ,
    key2: {
      Status: false,
      Label: ''
    },
    key3: {
      Status: false,
      Label: ''
    },
    key4: {
      Status: false,
      Label: ''
    },
    key5: '',
    key6: '',
    key7: new Date(),
}

const output = Object.entries(input).reduce((accu, [key, val]) => {
    if(typeof val != 'object' || input[key] instanceof Date) {
        accu[key] = "";
    } else {
        accu[key] = val;
    }
    return accu;
}, {});

console.log(output)

Answer 6

To simplify this task, you can utilize the reduce function. Simply set the keys with non-object values or instances of Date to an empty string.

const input = {
    key1 : '' ,
    key2: {
      Status: false,
      Label: ''
    },
    key3: {
      Status: false,
      Label: ''
    },
    key4: {
      Status: false,
      Label: ''
    },
    key5: '',
    key6: '',
    key7: new Date(),
}

const output = Object.entries(input).reduce((accu, [key, val]) => {
    if(typeof val != 'object' || input[key] instanceof Date) {
        accu[key] = "";
    } else {
        accu[key] = val;
    }
    return accu;
}, {});

console.log(output)

Answer 7

Answer №4

If you're looking for a solution, you can follow the advice given by Amardeep Bhowmick, or you have another option of creating a function within your service that will return the desired object. Here is an example of how you can set up this function:

private createObject():any{
    var object = {
            key1 : '' ,
            key2: {
              Status: false,
              Label: ''
            },
            key3: {
              Status: false,
              Label: ''
            },
            key4: {
              Status: false,
              Label: ''
            },
            key5: '',
            key6: '',
            key7: new Date(),

          }
    return object;
}

Simply call

this.UserDetails = this.createObject();

whenever you need to reset the object. You can also use this function to initialize the object for the first time.

Answer 8

If you're looking for a solution, you can follow the advice given by Amardeep Bhowmick, or you have another option of creating a function within your service that will return the desired object. Here is an example of how you can set up this function:

private createObject():any{
    var object = {
            key1 : '' ,
            key2: {
              Status: false,
              Label: ''
            },
            key3: {
              Status: false,
              Label: ''
            },
            key4: {
              Status: false,
              Label: ''
            },
            key5: '',
            key6: '',
            key7: new Date(),

          }
    return object;
}

Simply call

this.UserDetails = this.createObject();

whenever you need to reset the object. You can also use this function to initialize the object for the first time.

Tips for clearing object values without deleting the keys: Resetting the values of an object and its

Answer №1

Answer №2

Answer №3

Answer №4

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