How to remove an item from an array without knowing the index, only the value?

Question

I have an object array and I need to delete an object from that array but I don’t know the index that that object occupies in the array, as I can remove that object from inside the array?

Answer 1

In simple arrays you can do:

var arr = ['a', 'b', 'c'];
arr.splice(arr.indexOf('b'), 1);

console.log(arr);

In object arrays:

You can use the findIndex and then use the .splice or else use the .filter and create a new array:

With .filter()

var arr = [{
  valor: 1
}, {
  valor: 2
}, {
  valor: 3
}];

var numeroARemover = 3;

arr = arr.filter(obj => obj.valor != numeroARemover);
console.log(arr);

With .findIndex and .splice

var arr = [{
  valor: 1
}, {
  valor: 2
}, {
  valor: 3
}];

var numeroARemover = 3;

var indice = arr.findIndex(obj => obj.valor == numeroARemover);
arr.splice(indice, 1);
console.log(arr);

Answer 2

Using indexOf and splice

Search the item inside the array and after knowing the index remove the item:

var index = meuArray.indexOf("minhaChave");
meuArray.splice(index, 1);

Answer 3

One way to do this is by searching the Array for the object’s index and then removing it with .splice():

var a = new Array("um","dois","tres");
console.log("Array original:"+ a);
var indice = a.indexOf("dois"); // quero remover "dois" da Array
a.splice(indice, 1);
console.log("Array após:"+ a);