[NUMBERS-192] Add subtract method to Sum

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Implemented
• Affects Version/s: 1.1
• Fix Version/s: 1.2
• Component/s: core
• difficulty-level: Easy
• Assignee: Unassigned
• Reporter: Alex Herbert
• Created: 18/Jan/23 00:02
• Updated: 12/Aug/24 11:11
• Resolved: 19/Jan/23 12:53

Description

The Sum class can be used to add and subtract many terms. Subtraction of individual terms is performed by negating the argument and using the add method:

Sum.of(1, -2, 3, -4, 5).add(-6).add(7)

However there is no subtract method for subtraction of another sum to complement the add(Sum) method. This prevents using the extended precision part of the Sum in subtraction.

I suggest adding:

public Sum subtract(Sum other)