object has key code example

Example 1: how to check if object has key javascript

myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype

Example 2: js object contain key

if ('key' in myObj)
// better
if (!myObj.hasOwnProperty('key'))

Example 3: typescript check if object has key

if ('key' in myObj)

Example 4: hasOwnProperty

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

const object1 = {};
object1.property1 = 42;

console.log(object1.hasOwnProperty('property1'));
// expected output: true

console.log(object1.hasOwnProperty('toString'));
// expected output: false

Example 5: check object has key javascript

Object.prototype.hasOwnProperty()

Example 6: javascript if object has key

if('key' in object)