Programming exercise #13 - get only unique items from array of objects

	// so, you have list of users like this
	const users = [
	{ id: '1', name: 'hello' },
	{ id: '2', name: 'world' },
	{ id: '3', name: 'hello' },
	{ id: '1', name: 'hello' },
	{ id: '1', name: 'hello' },
	]
	// as a result, we want to get list of users without duplicates, basing on id.
	const res = [
	{ id: '1', name: 'hello' },
	{ id: '2', name: 'world' },
	{ id: '3', name: 'hello' }
	]
	// I suggest you, not to use forEach or for methods.

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