blob: 82e352cf13650cc922b3a8733133fe29d4ef817c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# Resistor Color
If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
For this exercise, you need to know two things about them:
* Each resistor has a resistance value.
* Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
Each band has a position and a numeric value.
The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
These colors are encoded as follows:
- Black: 0
- Brown: 1
- Red: 2
- Orange: 3
- Yellow: 4
- Green: 5
- Blue: 6
- Violet: 7
- Grey: 8
- White: 9
The goal of this exercise is to create a way:
- to look up the numerical value associated with a particular color band
- to list the different band colors
Mnemonics map the colors to the numbers, that, when stored as an array, happen to map to their index in the array: Better Be Right Or Your Great Big Values Go Wrong.
More information on the color encoding of resistors can be found in the [Electronic color code Wikipedia article](https://en.wikipedia.org/wiki/Electronic_color_code)
Although the color names are capitalised in the description, the function colorCode will always be called with the lowercase equivalent, e.g brown instead of Brown
## Setup
Go through the setup instructions for Javascript to install the necessary
dependencies:
[https://exercism.io/tracks/javascript/installation](https://exercism.io/tracks/javascript/installation)
## Requirements
Please `cd` into exercise directory before running all below commands.
Install assignment dependencies:
```bash
$ npm install
```
## Making the test suite pass
Execute the tests with:
```bash
$ npm test
```
In the test suites all tests but the first have been skipped.
Once you get a test passing, you can enable the next one by changing `xtest` to
`test`.
## Submitting Solutions
Once you have a solution ready, you can submit it using:
```bash
exercism submit resistor-color.js
```
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have
completed the exercise.
## Exercise Source Credits
Maud de Vries, Erik Schierboom [https://github.com/exercism/problem-specifications/issues/1458](https://github.com/exercism/problem-specifications/issues/1458)
|