Finden von Elementen bzw. Objekte in einem Array

find elements in array

//with array.some
var found = posts.some(el => el.id  === id ); // It returns true if id exist in an array
 if(found)
 {
  //Your codes here
 }

//with array.filter
var found = posts.filter(el => el.id === id).length > 0; // .length returns 1 if id exist in an array
if(found)
{
   //Your code goes here
}


//example to find element
let posts = [ { id: 1, username: 'foo' },{ id: 2, username: 'bar' } ];

let newObj = {"id": 3, "username": 'prasad'};
//console.log(posts);
let found = posts.some(el => el.id  === 2 );
 if(found)
 {
    for(num of posts){
        //console.log (3, num.id);
        if(4 === num.id){ 
          //Your code
            //console.log("error");
        } else {
          //Your code
            //console.log(num);
        }                
    }; 
    posts.push(newObj);
    console.log(posts);
 }