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Compare within margin

Description

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.

Source