Find object in array?

Question

Imagine I've got an array of objects like so (dummy code):

const chosenBets = [{...}, {...}] // 2 items

And I want to delete a specific item from the array:

{id: 0, // is unique
 label: 1,
 odd: 1.33,
 oddIndex: 0,
 team_home: "Liverpool",
 team_away: "Sheffield United",
 matchCardIndex: 0,}

So that array is now:

const chosenBets = [{...}] // 1 items

How would I achieve this?

rcoro · Accepted Answer · 2019-09-29 02:31:00Z

5

You can use array filter

const chosenBets = [{
  id: 0, // is unique
  label: 1,
  odd: 1.33,
  oddIndex: 0,
  team_home: "Liverpool",
  team_away: "Sheffield United",
  matchCardIndex: 0
}, {
  id: 1, // is unique
  label: 1,
  odd: 1.33,
  oddIndex: 0,
  team_home: "Liverpool",
  team_away: "Sheffield United",
  matchCardIndex: 0
}];

const filteredData = chosenBets.filter(item => item.id === 1);
console.log(filteredData);

edited Sep 29, 2019 at 2:31

rcoro

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answered Sep 28, 2019 at 14:23

brk

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Comments

ellipsis · Accepted Answer · 2019-09-28 14:27:28Z

1

You can use splice

var a = [{
    id: 0, // is unique
    label: 1,
    odd: 1.33,
    oddIndex: 0,
    team_home: "Liverpool",
    team_away: "Sheffield United",
    matchCardIndex: 0,
  },
  {
    id: 0, // is unique
    label: 11,
    odd: 1.33,
    oddIndex: 0,
    team_home: "Liverpool",
    team_away: "Sheffield United",
    matchCardIndex: 0,
  }
]
a.forEach((e, j) => {
  if (e.label == 1)
    a.splice(j, 1);
})
console.log(a)

answered Sep 28, 2019 at 14:27

ellipsis

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Comments

ZER0 · Accepted Answer · 2019-09-28 20:39:38Z

If you want to delete a specific and unique object, I would do something like:

let chosenBets = [{
  id: 0, // is unique
  label: 1,
  odd: 1.33,
  oddIndex: 0,
  team_home: "Liverpool",
  team_away: "Sheffield United",
  matchCardIndex: 0
}, {
  id: 1, // is unique
  label: 1,
  odd: 1.33,
  oddIndex: 0,
  team_home: "Liverpool",
  team_away: "Sheffield United",
  matchCardIndex: 0
}];

let index = chosenBets.findIndex(({id}) => id === 1);

// if you want to mutate the original array, otherwise use `slice`
chosenBets.splice(index, 1);
console.log(chosenBets);

filter is better if you want to remove a group of elements, not just one. The reason is, it keeps going to iterate all the elements of the array, so it always iterate the whole array, even if the element you want to remove is the first one. Using findIndex you just iterate until you find the element, and then return the index: so as average, it does less cycle.

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