blond / rangem

Range manipulation

rangem

The tool to range manipulation.

Install

$ npm install --save rangem

Usage

const rangem = require('rangem');

const ranges = rangem.union([{ from: 1, to: 5 }, { from: 5, to: 10 }]);

// ➜ [{ from: 1, to: 10 }]

const range = ranges.pop(); // { from: 1, to: 3 }

rangem.subtract(range, [{ from: 5, to: 7 }]);

// ➜ [{ from: 1, to: 5 }, { from: 7, to: 10 }]

API

• union(ranges)
• subtract(range, ranges)

union(ranges)

Unions intersecting ranges.

const union = require('rangem').union;

const ranges = [{ from: 1, to: 5 }, { from: 3, to: 6 }, { from: 10, to: 20 }];

union(ranges);

// ➜ [{ from: 1, to: 6 }, { from: 10, to: 20 }]

ranges

Type: {from: number, to: number}[] Default: []

The ranges to union.

subtract(range, ranges)

Subtract ranges from range.

const subtract = require('rangem').subtract;

const fromRange = { from: 10, to: 20 };
const whatRanges = [{ from: 10, to: 12 }, { from: 15, to: 18 }]

subtract(fromRange, whatRanges);

// ➜ [{ from: 12, to: 15 }, { from: 18, to: 20 }]

range

Type: {from: number, to: number}

The range from which will be deducted.

ranges

Type: {from: number, to: number}[] Default: []

The ranges which will be deducted.

License

MIT © Andrew Abramov

rangem's Issues

union: wrong combines if right boards in reverse order

const ranges = [
    { from: 10, to: 20 },
    { from: 10, to: 15 },
    { from: 10, to: 10 }
];

const unitedRanges = union(ranges);

Expected

[{ from: 10, to: 20 }]

Actual

[{ from: 10, to: 10 }]