range

• NAME
• FEATURES
• INSTALLATION
• SYNOPSIS
• DESCRIPTION
  • Why?
• EXPORTS
  • range (default)
• COMPATIBILITY
• DEVELOPMENT
  • NPM Scripts
• SEE ALSO
• VERSION
• AUTHOR
• COPYRIGHT AND LICENSE

NAME

inclusive-range - a no-frills number-range generator

FEATURES

• < 250 bytes minified and gzipped
• ranges include the start and end value (inclusive)
• ranges are iterable (no superfluous forEach, toArray etc. methods)
• optional step parameter
• ascending or descending ranges
• infinite ranges
• developer-friendly (TypeScript)

INSTALLATION

$ npm install inclusive-range

SYNOPSIS

import range from 'inclusive-range'

for (const value of range(1)) { // 1 to infinity
    console.log(value)
}

[...range(1, 5)]     // [1, 2, 3, 4, 5]
[...range(5, 1)]     // [5, 4, 3, 2, 1]
[...range(1, 10, 3)] // [1, 4, 7, 10]
[...range(10, 1, 3)] // [10, 7, 4, 1]

DESCRIPTION

This module exports a function which generates an iterable number range from the start value to the end value (inclusive) with an optional step. If the step is omitted, it defaults to 1. If the end is omitted, it defaults to Infinity. If the start is omitted, it defaults to 1.

Why?

There are dozens of range implementations on NPM, none of which DWIM.

Many return eager arrays rather than lazy iterables. Most are exclusive, e.g. range(1, 10) returns 1 to 9 rather than 1 to 10. Some are inclusive, but bolt on other features such as map or forEach methods, which may be useful as part of a library like wu.js, but which are superfluous in a standalone range function. Most aren't typed (TypeScript).

This has all the functionality I need and none of the functionality I don't need and clocks in at ~250 bytes minified and gzipped.

EXPORTS

range (default)

Type: range(start?: number, end?: number, step?: number) → Iterable<number>

import range from 'inclusive-range'

const asc  = Array.from(range(1, 5)) // [1, 2, 3, 4, 5]
const desc = Array.from(range(5, 1)) // [5, 4, 3, 2, 1]

for (const value of range(1, 10, 3)) {
    console.log(value) // 1, 4, 7, 10
}

Returns an iterable which generates numbers from start to end inclusive. The optional step (default: 1) is added (ascending) or subtracted (descending) from the previous value to produce the next value. If end is omitted, it defaults to Infinity. If start is omitted, it defaults to 1.

COMPATIBILITY

Any platform (browser, Node.js etc.) which supports ES6 generators.

DEVELOPMENT

NPM Scripts

The following NPM scripts are available:

• build - compile the library and save it to the target directory
• clean - remove the target directory and its contents
• rebuild - remove the target directory and regenerate the build
• test - typecheck the codebase, compile the library, and run the test suite

SEE ALSO

• r...e - not iterable, adds extra methods
• @sullux/fp-light-range - adds currying, no step

VERSION

0.0.1

AUTHOR

chocolateboy

COPYRIGHT AND LICENSE

Copyright © 2019 by chocolateboy.

This is free software; you can redistribute it and/or modify it under the terms of the Artistic License 2.0.