observablehq / observablehq/plot
When a reducer expects numeric input but is given non-numeric input, it should raise an error.
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Description
Following up on https://github.com/observablehq/plot/issues/399#issuecomment-890596083. For example, if you pass ordinal data (strings) to a sum reducer, Plot could detect that and raise a helpful error rather than producing NaN output.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the reducer path for the sum operation and how ordinal string data reaches it. Add coverage for non-numeric input and verify that the reducer raises a helpful error instead of producing NaN output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- d3js
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 58/100