ivan-nikitovic

const map = array => ({
	when: condition => ({
		then: modification => array.map(
			(item, index, collection) => condition(item, index, collection) ? modification(item, index, collection) : item,
		),
	}),
});

map([1, 2, 3]).when(number => number > 1).then(number => number * 2) // [1, 4, 6]