check if any objects in array contains property code example

Example 1: 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

Example 2: how to Check if an array contains an object in javascript

// To check if an array contains an Object

const myArrayObj = [{
    'username': 'Player 1',
    'email': '[email protected]'
}, {
    'username': 'Player 2',
    'email': '[email protected]'
}];

// Create a helper function to compear the objects
const isEqual = (first, second) => {
    return JSON.stringify(first) === JSON.stringify(second);
}

const result = myArrayObj.some(e => isEqual(e, {
    'username': 'Player 1',
    'email': '[email protected]'
}));

console.log(result); // true

Example 3: javascript array contains object

// Works in all browsers
if (array.index(object) !== -1) {
  console.log(`my object is in my array`)
}

// ES7 :
if(array.includes(oject)) {
  console.log(`my object is in my array`)
}