Adding a fourth canonical exercise to the 'resistor color' series by Cool-Katt · Pull Request #2682 · exercism/problem-specifications

Cool-Katt · 2026-09-08T11:24:58Z

No description provided.

Cool-Katt · 2026-09-08T12:17:10Z

Okay, so
This is a port of the fourth exercise in the 'resistor colours' series, taken pretty much as is from the Python track.
Discussion can be found here

After many attempts, every check except for the links passes. I don't think I can do much about the links in this PR and it's out of scope so it should be fine™️

zeektvbox01-hub · 2026-09-16T08:12:55Z

+So an input `list` of `["orange", "orange", "blue", "red"]` should return:
+
+"33 megaohms ±2%"
+


Could you mention the decimals used

glennj · 2026-09-16T11:40:58Z

Resistors are nightmare fuel for the colourblind.

IsaacG · 2026-09-16T16:44:35Z

+The program will take 1, 4, or 5 colors as input and output the correct value in ohms.
+The color bands are encoded as follows:
+
+- black: 0


Could we switch to a table for the colors (here and tolerance)?

kotp

Approving, but provided suggestion that could be put in place, in agreement with @IsaacG .

kotp · 2026-09-16T21:26:55Z

+- black: 0
+- brown: 1
+- red: 2
+- orange: 3
+- yellow: 4
+- green: 5
+- blue: 6
+- violet: 7
+- grey: 8
+- white: 9


Suggested change

- black: 0

- brown: 1

- red: 2

- orange: 3

- yellow: 4

- green: 5

- blue: 6

- violet: 7

- grey: 8

- white: 9

| Color | Value |

|-------------|-------|

| Black | 0 |

| Brown | 1 |

| Red | 2 |

| Orange | 3 |

| Yellow | 4 |

| Green | 5 |

| Blue | 6 |

| Violet | 7 |

| Gray | 8 |

| White | 9 |

|-------------|-------|

For convenience, in case you want to use this.

I did not leave it in a more "codey" flavor, since it is the information not the formatting that is important here (the dash and colon looks like adherence to some formal syntax for some languages data structures).

kotp · 2026-09-16T21:28:29Z

+- grey - 0.05%
+- violet - 0.1%
+- blue - 0.25%
+- green - 0.5%
+- brown - 1%
+- red - 2%
+- gold - 5%
+- silver - 10%


Suggested change

- grey - 0.05%

- violet - 0.1%

- blue - 0.25%

- green - 0.5%

- brown - 1%

- red - 2%

- gold - 5%

- silver - 10%

| Color | Tolerance |

|--------|----------:|

| Grey | ±0.05% |

| Violet | ±0.10% |

| Blue | ±0.25% |

| Green | ±0.50% |

| Brown | ±1.00% |

| Red | ±2.00% |

| Gold | ±5.00% |

| Silver | ±10.00% |

|--------|-----------|

Or if you want to right-align the Tolerances:

| Color | Tolerance | | ----------- | --------: | | Grey | 0.05% | | Silver | 10% |

Color Tolerance

Grey 0.05%

Silver 10%

Formatting content within your table

We probably need to include the ± symbol here, since IIRC, the tests check for it.

Good catch. If anyone wants to amend, feel free, since I'm away from a computer for a while.

Should be able to click on "Apply suggestion" if it is looking OK now.

BethanyG · 2026-09-16T22:39:53Z

+title = "Resistor Color Tolerance"
 blurb = "Convert color codes as used on resistors with different bands to a human-readable label."
-source = "Ported for the Python Track"
+source = "Ported from the Python Track"


Since Meatball was the genesis of this exercise on the Python track, we should give him author credit here. (Sorry - I missed this the first time around)

Do you have a link to the original conversation then, or should it be just 'credit to Meatball'

Suggested change

source = "Ported from the Python Track"

source = "Meatball"

or

Suggested change

source = "Ported from the Python Track"

source = "@meatball133"

+cc @meatball133 for input :)

For relative-distance, we just used vaeng without an @ and the source URL was the problem specs PR. From that context, it was clear vaeng was an Exercism / GitHub user. However, we probably shouldn't link to this PR (given it's by Cool-Katt not meatball) but the original exercise PR on the Python track OR an Exercism profile. vaeng is not an English word so it likely wouldn't be read as such while meatball is. "@Meatball" makes it clearer it's likely an online handle on Exercism or elsewhere.

zeektvbox01-hub

Try to add a mention of decimal values

Initial commit

dc1738d

Cool-Katt requested a review from a team as a code owner September 8, 2026 11:24

Cool-Katt added 3 commits September 8, 2026 14:44

Fixing my stupid trailing comma mistake

3b69921

More stupid formatting fixes.

96ef5a8

Please no more CI errors...

e20a463

BethanyG approved these changes Sep 8, 2026

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IsaacG approved these changes Sep 8, 2026

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Comment thread exercises/resistor-color-tolerance/description.md

Comment thread exercises/resistor-color-tolerance/canonical-data.json

Comment thread exercises/resistor-color-expert/metadata.toml Outdated

Name change and scenarios addition

d579af7

zeektvbox01-hub reviewed Sep 16, 2026

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Comment thread exercises/resistor-color-tolerance/metadata.toml Outdated

Dyslexia go the better of me

9685af6

zeektvbox01-hub reviewed Sep 16, 2026

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glennj approved these changes Sep 16, 2026

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IsaacG approved these changes Sep 16, 2026

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kotp approved these changes Sep 16, 2026

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BethanyG reviewed Sep 16, 2026

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zeektvbox01-hub approved these changes Sep 17, 2026

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BNAndras approved these changes Sep 18, 2026

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		So an input `list` of `["orange", "orange", "blue", "red"]` should return:

		"33 megaohms ±2%"

-- black: 0
-- brown: 1
-- red: 2
-- orange: 3
-- yellow: 4
-- green: 5
-- blue: 6
-- violet: 7
-- grey: 8
-- white: 9
+| Color       | Value |
+|-------------|-------|
+| Black       | 0     |
+| Brown       | 1     |
+| Red         | 2     |
+| Orange      | 3     |
+| Yellow      | 4     |
+| Green       | 5     |
+| Blue        | 6     |
+| Violet      | 7     |
+| Gray        | 8     |
+| White       | 9     |
+|-------------|-------|

-- grey - 0.05%
-- violet - 0.1%
-- blue - 0.25%
-- green - 0.5%
-- brown - 1%
-- red - 2%
-- gold - 5%
-- silver - 10%
+| Color  | Tolerance |
+|--------|----------:|
+| Grey   | ±0.05%    |
+| Violet | ±0.10%    |
+| Blue   | ±0.25%    |
+| Green  | ±0.50%    |
+| Brown  | ±1.00%    |
+| Red    | ±2.00%    |
+| Gold   | ±5.00%    |
+| Silver | ±10.00%   |
+|--------|-----------|

	source = "Ported from the Python Track"
	source = "@meatball133"

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