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function addOne(v) {
	return v + 1	
}
function mapowanie(arr,fn) {
	var list = []
	for (let i = 0; i < arr.length; i++) {
		list[i] = fn(arr[i])
	}

	return list
}

var x = mapowanie([1,2,3,4,5], addOne) //[2,3,4,5,6]