> new Array('a') ["a"] > new Array(2, 3) [2, 3] > new Array(2) [undefined, undefined] > new Array(2.3) RangeError: invalid array length > new Ar

> new Array('a') ["a"] > new Array(2, 3) [2, 3] > new Array(2) [undefined, undefined] > new Array(2.3) RangeError: invalid array length > new Array(2.3, 4.5) [2.3, 4.5] The Array constructor is really bogus. It switches to a different mode if a single number is passed. ES6 added `Array.of` for this reason: > Array.of() [] > Array.of(1) [1] > Array.of(1, 2) [1, 2] I don't really think it's needed though. Spread and rest already take care of the common use cases.