Range

Requirements

• Implement range(start = 0, end, step). With one bound, generate from 0 towards that bound. With no arguments, return [].
• Include start and exclude end. Default step is 1 when start <= end and -1 otherwise. Explicit steps may be positive or negative.
• Preserve generation order. Positive steps produce ascending values; negative steps produce descending values.
• Equal bounds or a step pointing away from end returns []. A zero step, fractional value, NaN, or Infinity in any supplied number also returns [].
• Assume numeric arguments and valid ranges containing at most 10,000 values. Return a fresh array on every call. Do not modify global objects.

Examples

Input: range(4)
Output: [0, 1, 2, 3]

Input: range(2, 9, 3)
Output: [2, 5, 8]

Input: range(-3)
Output: [0, -1, -2]