dice-coefficient

Sørensen–Dice coefficient.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • diceCoefficient(value, other)
• CLI
• Types
• Compatibility
• Related
• Contribute
• Security
• License

What is this?

This package exposes a string similarity algorithm. That means it gets two strings (typically words), and turns it into a number between 0 (completely different) and 1 (exactly the same).

When should I use this?

You’re probably dealing with natural language, and know you need this, if you’re here!

Install

This package is ESM only. In Node.js (version 14.14+, 16.0+), install with npm:

npm install dice-coefficient

In Deno with esm.sh:

import {diceCoefficient} from 'https://esm.sh/dice-coefficient@2'

In browsers with esm.sh:

<script type="module">
  import {diceCoefficient} from 'https://esm.sh/dice-coefficient@2?bundle'
</script>

Use

import {diceCoefficient} from 'dice-coefficient'

diceCoefficient('abc', 'abc') // => 1
diceCoefficient('abc', 'xyz') // => 0
diceCoefficient('night', 'nacht') // => 0.25
diceCoefficient('night', 'nacht') === dice('NiGhT', 'NACHT') // => true

API

This package exports the identifier diceCoefficient. There is no default export.

diceCoefficient(value, other)

Get the difference according to Sørensen–Dice.

👉 Note: you can pass bigrams (from n-gram) too, which will improve performance when you are comparing the same values multiple times.

value

Primary value (string, Array<String>, required).

other

Other value (string, Array<String>, required).

Returns

Difference (number).

The result is normalized to a number between 0 (completely different) and 1 (exactly the same).

CLI

Usage: dice-coefficient [options] <word> <word>

Sørensen–Dice coefficient

Options:

  -h, --help           output usage information
  -v, --version        output version number

Usage:

# output edit distance
$ dice-coefficient night nacht
# 0.25

# output edit distance from stdin
$ echo "saturday sunday" | dice-coefficient
# 0.3333333333333333

Types

This package is fully typed with TypeScript. It exports no additional types.

Compatibility

This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. It also works in Deno and modern browsers.

Related

• levenshtein-edit-distance — levenshtein edit distance
• lancaster-stemmer — lancaster stemming algorithm
• double-metaphone — double metaphone algorithm
• soundex-code — soundex algorithm
• syllable — syllable count of English words

Contribute

Yes please! See How to Contribute to Open Source.

Security

This package is safe.

License

MIT © Titus Wormer