`@eturino/significant-diff-round`

util to round 2 numbers to the enough number of decimals to show the difference between them

Installation

yarn add @eturino/significant-diff-round or npm install @eturino/significant-diff-round.

Usage

Given 2 numbers, an an optional minimum precision, significantDiffRound() will round them to the precision needed to be significantly different, so that the 2 rounded numbers are not equal.

The idea is to avoid rounding 1.123 and 1.124 to 1.12 in both cases, loosing the ability to spot the difference.

If the given numbers are the same, they will be returned rounded to the minimum precision specified (default 0).

The results are returned in an object of the form { a: roundedFirstNumber, b: roundedSecondNumber, precision: numberOfDecimals }

e.g.

import significantDiffRound from "@eturino/significant-diff-round";

// same number
significantDiffRound(1.123, 1.123); // => { a: 1, b: 1, precision: 0 }
significantDiffRound(1.123, 1.123, 2); // => { a: 1.12, b: 1.12, precision: 2 }

// numbers diff in int part
significantDiffRound(1.123, 2.321); // => { a: 1, b: 2, precision: 0 }
significantDiffRound(1.123, 2.321, 1); // => { a: 1.1, b: 2.3, precision: 1 }

// numbers diff in decimal part
significantDiffRound(1.123, 1.21); // => { a: 1.1, b: 1.2, precision: 1 }
significantDiffRound(1.123, 1.21, 2); // => { a: 1.12, b: 1.21, precision: 2 }
significantDiffRound(1.1234111, 1.12323313); // => { a: 1.1234, b: 1.1232, precision: 4 }
significantDiffRound(1.12321414, 1.1236531541); // => { a: 1.123, b: 1.124, precision: 3 }

// max precision (depends on Number.EPSILON)
significantDiffRound(1, 0.9999999999999998); // => { a: 1, b: 0.9999999999999998, precision: 16 }

Development, Commits, versioning and publishing

See documentation for development

See The Typescript-Starter docs.

Commits and CHANGELOG

For commits, you should use commitizen

yarn global add commitizen

#commit your changes:
git cz

As typescript-starter docs state:

This project is tooled for conventional changelog to make managing releases easier. See the standard-version documentation for more information on the workflow, or CHANGELOG.md for an example.

# bump package.json version, update CHANGELOG.md, git tag the release
yarn run version

You may find a tool like wip helpful for managing work in progress before you're ready to create a meaningful commit.

Creating the first version

Once you are ready to create the first version, run the following (note that reset is destructive and will remove all files not in the git repo from the directory).

# Reset the repo to the latest commit and build everything
yarn run reset && yarn run test && yarn run doc:html

# Then version it with standard-version options. e.g.:
# don't bump package.json version
yarn run version -- --first-release

# Other popular options include:

# PGP sign it:
# $ yarn run version -- --sign

# alpha release:
# $ yarn run version -- --prerelease alpha

And after that, remember to publish the docs.

And finally push the new tags to github and publish the package to npm.

# Push to git
git push --follow-tags origin master

# Publish to NPM (allowing public access, required if the package name is namespaced like `@somewhere/some-lib`)
yarn publish --access public

Publish the Docs

yarn run doc:html && yarn run doc:publish

This will generate the docs and publish them in github pages.

Generate a version

There is a single yarn command for preparing a new release. See One-step publish preparation script in TypeScript-Starter

# Prepare a standard release
yarn prepare-release

# Push to git
git push --follow-tags origin master

# Publish to NPM (allowing public access, required if the package name is namespaced like `@somewhere/some-lib`)
yarn publish --access public