Add property to each object in array

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// Write a function that takes an array of objects and a string as arguments
// Add a property with key 'continent' and value equal to the string to each of the objects
// Return the new array of objects
// Tipp: try not to mutate the original array
			function
				myFunction
				(
				arr, str
				)
				{
			
				
				
return 

			}

Test Cases:

myFunction([{ city: 'Tokyo', country: 'Japan' }, { city: 'Bangkok', country: 'Thailand' }], 'Asia')

Expected

[{ city: 'Tokyo', country: 'Japan', continent: 'Asia' }, { city: 'Bangkok', country: 'Thailand', continent: 'Asia' }]

myFunction([{ city: 'Stockholm', country: 'Sweden' }, { city: 'Paris', country: 'France' }], 'Europe')

Expected

[{ city: 'Stockholm', country: 'Sweden', continent: 'Europe' }, { city: 'Paris', country: 'France', continent: 'Europe' }]