What is this?

Typescript utilities for working with rock climbing grades.

Supported systems

Sport & Traditional climbing

• Yosemite Decimal System
• French
• UIAA
• Ewbanks
• Saxon
• Brazilian
• Norwegian

Bouldering

• Vermin (V-scale)
• Fontainebleau

Aid

• A# & C#
• Aid with mandatory free climbing (5.8 A0, etc)

Ice

• Winter Ice (WI#)
• Alpine Ice (AI#)

Help Wanted

Code contributions are most welcome!

Questions?

Join us on Discord.

How to use the library

Install the package

Using NPM

npm install @openbeta/sandbag

Using Yarn

yarn add @openbeta/sandbag

Sample Usage

Convert Grades to Scores

import { French, YosemiteDecimal } from "@openbeta/sandbag";

const score = French.getScore("8a"); // Output [ 84, 85 ]

// Support slash grade
const slashGradeScore = French.getScore("7c+/8a"); // Output [ 83, 84 ]

// Accept +/- modifier
const plusGrade = YosemiteDecimal.getScore("5.12+"); // Output [ 79, 80 ]

Convert Scores to Grades

import { Font } from "@openbeta/sandbag";

// Single score provided
Font.getGrade(80); // Output '7c'

// Support a range of scores
Font.getGrade([79, 81]); // Output'7b+/7c'

Validate Grading Scales

import { VScale, Font } from "@openbeta/sandbag";

console.log("Is 6A a V Scale?", VScale.isType("6A")); // Output false
console.log("Is 6A a Font Scale?", Font.isType("6A")); // Output true

Convert Grades Across Scales

import { convertGrade, GradeScales } from "@openbeta/sandbag";

const ydsInFrench = convertGrade("5.11a", GradeScales.YDS, GradeScales.FRENCH); // Output '6b+/6c'

const fontInVScale = convertGrade("6a", GradeScales.FONT, GradeScales.VSCALE); //OutPut 'V3'

// Conversions across different disciplines are not allowed
const sportToBoulder = convertGrade(
	"5.11a",
	GradeScales.YDS,
	GradeScales.VSCALE,
);
// Output: Scale: Yosemite Decimal System doesn't support converting to Scale: V Scale
// ''

Get Gradeband

import { Ewbank } from "@openbeta/sandbag";

Ewbank.getGradeBand("10"); // Output: 'beginner'
Ewbank.getGradeBand("30"); // Output: 'expert'
Ewbank.getGradeBand("6a"); // Output: Unexpected grade format: 6a for grade scale Ewbank 'unknown'

Compare Grades

import { French, YosemiteDecimal } from "@openbeta/sandbag";

const harder = French.getScore("8a"); // Output: [ 84, 85 ]
const easier = YosemiteDecimal.getScore("5.13a"); // Output: [ 82, 83 ]

console.log("Is 8a harder than 5.13a?", harder > easier); // Output: true

See unit tests for more examples.

Development (TBD)

yarn install
yarn test

Generating Test Coverage Report

To generate a test coverage report using Jest run the following command in your terminal:

npx jest --coverage

If you're using macOS, you can directly access the coverage report in your browser by opening the following URL:

file:///Users/<userName>/sandbag/coverage/lcov-report/index.html

How to publish a new release to NPM

Submit a PR with commit message [npm publish]

Project Maintainers

• Nathan Musoke
• Viet Nguyen

License

MIT

Contributors ✨

Thanks goes to these wonderful people (emoji key):

AntoineM 💻 🤔	Kendra Gibbons 💻 🤔	MichaelDimmitt 💻	Clinton Lunn 💻	Darren Lew 💻 🤔	Klaus 💻 🤔	Nathan Musoke 💻 🤔
Talia Aleyna Hortac 💻	Yun Ji 💻 🤔	Josh Zimmerman 💻	John Roberts 💻 🤔	Joey Marino 💻 🤔	Iacami Gevaerd 💻 🤔

This project follows the all-contributors specification. Contributions of any kind welcome!