jsrange

An extremely simple range lib, for expanding "1..3,5..7"-like strings into [1, 2, 3, 5, 6, 7]

Install

npm install --save jsrange

Examples

var range = require('jsrange');

// Every even number from 2 to 100:
range("2 .. 100 x 2");

// -20 to 30, stepping by 3 each time:
range("-20 .. 30 x 3");

// 2, 10, and 11:
range("2, 10, 11");

// 20 down to 12, then 12 back to 20 by 3s:
range("20 .. 12, 12 .. 20 x 3");

Specifics on Syntax

• You have any number of ,-deliminated sections. Each section will be represented in the result, in order.
• Each section should be one of these types:
  • A single value.
    (eg: "5" or "-20".)
  • A start and an end value separated by ...
    (eg: "1..42" or "7 .. -13")
  • A start and an end value separated by .., with a positive step value after a x.
    (eg: "1 .. 10 x 3" or "22 .. -13 x 5")

License

MIT