site/node_modules/parse-numeric-range/README.md

node-parse-numeric-range

Parses expressions like 1-10,20-30. Returns an energetic (as opposed to lazy) array.

Supported Expressions

Comprehensive supported expression examples:

Expression	result
	[]
1	[1]
1,2	[1,2]
-10	[-10]
-3,-3	[-3, -3]
-1-2,-2	[-1,0,1,2,-2]
-1--2	[-1,-2]
-1..2,-2	[-1,0,1,2,-2]
-1...3,-2	[-1,0,1,2,-2]
1⋯3	[1,2]
1…3	[1,2]
1‥3	[1,2,3]

What's this useful for? Well, letting users input these sorts of things and then making them programmatically useful.

Usage

First, npm install parse-numeric-range.

const rangeParser = require("parse-numeric-range");

const numbers = rangeParser("4,6,8-10,12,14..16,18,20...23");

console.log(
  `The first ${numbers.length} composite numbers are: ${numbers.join(", ")}`,
);

ES6

import rangeParser from "parse-numeric-range";

const numbers = rangeParser("4,6,8-10,12,14..16,18,20...23");

console.log(
  `The first ${numbers.length} composite numbers are: ${numbers.join(", ")}`,
);