JSFiddle - React, Tailwind, and code Playground

JavaScript

const arr = [
	{
  	id:1,
    name:'anon'
  },
  {
  	id:4,
    name:'karasique'
  },
  {
  	id:8,
    name:'toha'
  }
]

function deleteItem(id) {
  let indexTodelete;
  arr.forEach( (item,index) => {
    item.id == id ? indexTodelete = index : '';
  })
  arr.splice(indexTodelete,1);
}

deleteItem(4);
console.log(arr)