Convert any range to an exclusive range in natural order.

npm install natural-range

var assert = require('assert');
var Range = require('natural-range');

var range = new Range({ from: 3, to: 1 });

assert.equal(range.from, 1);
assert.equal(range.to, 4);
assert.equal(range.reversed, true);

See test/test.js for more examples.

var range = new Range(options);

• options - an object literal supports these options:

  • from - the start number
  • to - the end number
  • exclusive - a boolean denoting if the range is exclusive
  • length - if from or to is negative, and this option is provided, the negative number means backwards indexing and is relative to length

• range - the range object in natural order containing these properties:

  • from - the start number
  • to - the end number
  • reversed - a boolean denoting if the original range is in reversed order