How to locate and remove an object in Angular 6

Question

How to locate and remove an object in Angular 6

What is the method to remove an object from a list of objects using an id number in Angular 6 with TypeScript?

EntityService.ts

import { Injectable } from '@angular/core';
import { Entity } from '../../models/entity';

@Injectable({
  providedIn: 'root'
})
export class EntityService {

  entities: Entity[] = [
    {
      id: 1, 
      name: 'Entity 1'
    },
    {
      id: 2, 
      name: 'Entity 2'
    },
    {
      id: 3, 
      name: 'Entity 3'
    }
  ];

  constructor() { }

  deleteEntity(id: number) {
    // ???
  }

}

angular typescript

Answer 1

Answer №1

To exclude a specific item while keeping the rest, you can utilize the filter method:

removeItem(id: number) {
  this.items = this.items.filter(item => item.id !== id);
}

Answer 2

To exclude a specific item while keeping the rest, you can utilize the filter method:

removeItem(id: number) {
  this.items = this.items.filter(item => item.id !== id);
}

Answer 3

Answer №2

If you're looking to locate and remove an element, there's a modern approach in ES6/2015 that involves using the findIndex method along with the array spread operator:

deleteEntity(id: number) {
    const index = Entities.findIndex(obj => obj.id === id);
    const newData = [
        ...Entities.slice(0, index)
    ];
}

UNIQUE BENEFIT COMPARED TO PREVIOUS SOLUTION:

The findIndex function is optimized to stop iterating once the desired element is found.

let Entities = [
    {
      id: 1, 
      name: 'Entity 1'
    },
    {
      id: 2, 
      name: 'Entity 2'
    },
    {
      id: 3, 
      name: 'Entity 3'
    }
  ];

let entityId = 3;
const index = Entities.findIndex(obj => obj.id === entityId);
const newData = [
    ...Entities.slice(0, index)
];

console.log(newData);

Answer 4

If you're looking to locate and remove an element, there's a modern approach in ES6/2015 that involves using the findIndex method along with the array spread operator:

deleteEntity(id: number) {
    const index = Entities.findIndex(obj => obj.id === id);
    const newData = [
        ...Entities.slice(0, index)
    ];
}

UNIQUE BENEFIT COMPARED TO PREVIOUS SOLUTION:

The findIndex function is optimized to stop iterating once the desired element is found.

let Entities = [
    {
      id: 1, 
      name: 'Entity 1'
    },
    {
      id: 2, 
      name: 'Entity 2'
    },
    {
      id: 3, 
      name: 'Entity 3'
    }
  ];

let entityId = 3;
const index = Entities.findIndex(obj => obj.id === entityId);
const newData = [
    ...Entities.slice(0, index)
];

console.log(newData);

How to locate and remove an object in Angular 6

Answer №1

Answer №2

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