Kata

Create a function close_compare that accepts 3 parameters: a, b, and an optional margin. The function should return whether a is lower than, close to, or higher than b.

Please note the following:

• When a is close to b, return 0.
  • For this challenge, a is considered "close to" b if margin is greater than or equal to the absolute distance between a and b.

Otherwise...

• When a is less than b, return -1.

• When a is greater than b, return 1.

If margin is not given, treat it as if it were zero.

Assume: margin >= 0

Tip: Some languages have a way to make parameters optional.

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Example 1

If a = 3, b = 5, and margin = 3, then close_compare(a, b, margin) should return 0.

This is because a and b are no more than 3 numbers apart.

Example 2

If a = 3, b = 5, and margin = 0, then close_compare(a, b, margin) should return -1.

This is because the distance between a and b is greater than 0, and a is less than b.