javascript check if value exists in array of objects
var arr = [{ id: 1, name: 'JOHN' }, 
  { id: 2, name: 'JENNIE'}, 
  { id: 3, name: 'JENNAH' }];
function userExists(name) {
  return arr.some(function(el) {
    return el.name === name;
  }); 
}
console.log(userExists('JOHN')); // true
console.log(userExists('JUMBO')); // false
