Python's math.dist in TypeScript

How to use

Install via yarn add locutus and import: import { dist } from 'locutus/python/math/dist'.

Or with CommonJS: const { dist } = require('locutus/python/math/dist')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	dist([0, 0], [3, 4])	5
2	dist([1, 2, 3], [1, 2, 3])	0
3	dist([-1, 2], [2, -2])	5

Notes

• Returns Euclidean distance between two same-length numeric vectors.

Here's what our current TypeScript equivalent to Python's math.dist looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function dist(p: number[] | unknown, q: number[] | unknown): number {
  //      discuss at: https://locutus.io/python/dist/
  // parity verified: Python 3.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns Euclidean distance between two same-length numeric vectors.
  //       example 1: dist([0, 0], [3, 4])
  //       returns 1: 5
  //       example 2: dist([1, 2, 3], [1, 2, 3])
  //       returns 2: 0
  //       example 3: dist([-1, 2], [2, -2])
  //       returns 3: 5

  if (!Array.isArray(p) || !Array.isArray(q)) {
    throw new TypeError('dist() requires array-like arguments')
  }

  if (p.length !== q.length) {
    throw new Error('dist() points must have the same dimension')
  }

  let sum = 0
  for (let i = 0; i < p.length; i += 1) {
    const left = Number(p[i])
    const right = Number(q[i])
    const delta = left - right
    sum += delta * delta
  }

  return Math.sqrt(sum)
}

export function dist(p, q) {
  //      discuss at: https://locutus.io/python/dist/
  // parity verified: Python 3.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns Euclidean distance between two same-length numeric vectors.
  //       example 1: dist([0, 0], [3, 4])
  //       returns 1: 5
  //       example 2: dist([1, 2, 3], [1, 2, 3])
  //       returns 2: 0
  //       example 3: dist([-1, 2], [2, -2])
  //       returns 3: 5

  if (!Array.isArray(p) || !Array.isArray(q)) {
    throw new TypeError('dist() requires array-like arguments')
  }

  if (p.length !== q.length) {
    throw new Error('dist() points must have the same dimension')
  }

  let sum = 0
  for (let i = 0; i < p.length; i += 1) {
    const left = Number(p[i])
    const right = Number(q[i])
    const delta = left - right
    sum += delta * delta
  }

  return Math.sqrt(sum)
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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