check if value is in object javascript code example

Example 1: javascript if field exists

const hero = {
  name: 'Batman'
};

hero.hasOwnProperty('name');     // => true
hero.hasOwnProperty('realName'); // => false

Example 2: check if property has value in array javascript

const magenicVendorExists =  vendors.reduce((accumulator, vendor) => (accumulator||vendor.Name === "Magenic"), false);

Example 3: check if field exists in object javascript

if ('field' in obj) {
}