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I am having trouble deleting an element inside an array of objects. I want to simply delete an object inside the array. When I try to use .IndexOf(). It gives me back -1. is there a way to do this without creating a reference to each object.

This is my Array of objects.

   let todos = [{
      id: 1,
      task: 'Finish This React App'
    },{
      id: 2,
      task: 'Do Another App'
    },{
      id: 3,
      task: 'Pass data from the parent to the child and reverse'
    }]

let task = {id:2,task:'Do Another App'}

let todosArray = this.props.todos

todosArray.indexOf(task,0) //= -1

Overall I want to only have objects 1 and 3 inside the todos array.

I am having trouble deleting an element inside an array of objects. I want to simply delete an object inside the array. When I try to use .IndexOf(). It gives me back -1. is there a way to do this without creating a reference to each object.

This is my Array of objects.

   let todos = [{
      id: 1,
      task: 'Finish This React App'
    },{
      id: 2,
      task: 'Do Another App'
    },{
      id: 3,
      task: 'Pass data from the parent to the child and reverse'
    }]

let task = {id:2,task:'Do Another App'}

let todosArray = this.props.todos

todosArray.indexOf(task,0) //= -1

Overall I want to only have objects 1 and 3 inside the todos array.

• javascript
• reactjs

Share Improve this question Follow asked Aug 22, 2016 at 19:31 BrianBrian 11111 gold badge44 silver badges1313 bronze badges 2

• This isn't a react question. – ray Commented Aug 22, 2016 at 19:41
• @brian-bier didn't specify this, but in react you should never modify the original value when changing state. I believe his question is about achieving this. Not just about removing from an array – user1372408 Commented Feb 1, 2018 at 15:20

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 6

You can use filter in pure vanillia ES6 :

var array = todos.filter(item => item.id === 1 || item.id === 3);

The Array#indexOf method always returns -1 since the objects reference is not the same.

You can use Array#findIndex, Array#every, Object.keys() and Array#splice methods.

let todos = [{
  id: 1,
  task: 'Finish This React App'
}, {
  id: 2,
  task: 'Do Another App'
}, {
  id: 3,
  task: 'Pass data from the parent to the child and reverse'
}]

let task = {
  id: 2,
  task: 'Do Another App'
};
let keys = Object.keys(task);

// remove element from the array by index
todos.splice(
  // get the index of the element
  todos.findIndex(function(obj) {
    // check all property values are equal
    return keys.every(function(k) {
      return task[k] === obj[k];
    });
    // if you want to check only the `id` property then     // you can avoid the above codes and use
    // return obj.id === task.id;
  }), 1);

console.log(todos)

Note : Above methods only works if there is no nested object and array property value.

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