drange

drange

For adding/subtracting sets of range of numbers.

Usage

const DRange = require('drange');

var allNums = new DRange(1, 100); //[ 1-100 ]
var badNums = DRange(13).add(8).add(60,80); //[8, 13, 60-80]
var goodNums = allNums.clone().subtract(badNums);
console.log(goodNums.toString()); //[ 1-7, 9-12, 14-59, 81-100 ]
var randomGoodNum = goodNums.index(Math.floor(Math.random() * goodNums.length));

API

new DRange([low], [high])

Creates a new instance of DRange.

DRange#length

The total length of all subranges

DRange#add(low, high)

Adds a subrange

###DRange#add(drange) Adds all of another DRange's subranges

DRange#subtract(low, high)

Subtracts a subrange

DRange#subtract(drange)

Subtracts all of another DRange's subranges

DRange#intersect(low, range)

Keep only subranges that overlap the given subrange

DRange#intersect(drange)

Intersect all of another DRange's subranges

DRange#index(i)

Get the number at the specified index

var drange = DRange()
drange.add(1, 10);
drange.add(21, 30);
console.log(drange.index(15)); // 25

DRange#clone()

Clones the drange, so that changes to it are not reflected on its clone

Install

npm install drange

Tests

Tests are written with mocha

npm test