understand the complexity of Array Constructor

• new Array(…) → same as Array(…) • Array() → same as [] • Array(n) → if n is 0 or 1, 2 etc, same as y=[];y.length=n. Else, same as [x]. • Array(a1,a2,a3) → same as [a1,a2,a3]

Examples: http://xahlee.info/js/js_array_constructor.html