josdejong/mathjs

UnaryMinus around ConstantNode not mached by "c" in simplify

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#1,406 opened on Feb 15, 2019

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Description

A unaryMinus wrapped around a ConstantNode is matched by "v", not "c", in the simplify function. While this matches the documentation, it is not what is expected for a "constant" and a "non-constant". Other single variable functions with a constant node are simplified to their result, and thus can be matched with "c". If existing compatibility presents an issue, this could be enabled as an option of the simplify function that defaults to the old behavior or by adding two new simplification selectors.

Contributor guide

Research direction
Examine the simplify function in the mathjs source code to understand how unaryMinus nodes are matched. Consider adding an option to treat unaryMinus of constants as constants.
Tech stack
javascript
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJavaScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75