Check if Javascript object has a property or key

You can use this object-hasOwnProperty Javascript component to check if a Javascript object as a property or key.

Example:

hasOwnProperty({foo: 'bar'}, 'foo') // => true hasOwnProperty({foo: 'bar'}, 'bar') // => false

Src code:

function hasOwnProperty(obj: {}, prop: string|number): boolean { return Object.prototype.hasOwnProperty.call(obj, prop); };