Readme.md

Version Fallback

中文版

Pick the best version you need.

For example, we need find out the latest version we can choose from all we got.

We have three version Chrome, saying version 40, 50, 60. We got a mission need be run some scripts in Chrome no newer than version 52. We could choose the correct version using this package.

This is just a simple example for explaining what kind job could be done by this simple package. This package is designed to solve problems like this.

Usage

npm install fallback-version --save
# or
yarn add fallback-version

Simple Version Fallback

const { Version } = require('fallback-version');
const V = new Version();
V.loadVersionSet(new Set(['Chrome/10', 'Chrome/50', 'Chrome/60', 'Chrome/65']));
const test = 'Chrome/62';
const result = V.match(test); // result [ 'Chrome', 60]

Failed to match

const { Version } = require('fallback-version');
const V = new Version();
V.loadVersionSet(new Set(['Chrome/10', 'Chrome/50', 'Chrome/60', 'Chrome/65']));
const test = 'Safari/62';
const result = V.match(test); // result [ 'Unknown', 60]

Something more complex

const { Version } = require('fallback-version');
const V = new Version();
V.loadVersionSet(
  new Set([
    "Jimmy's favorite browser is Chrome and version 40 is the best.",
    "Tom's favorite browser is Chrome and version 55 is the best.",
    "John's favorite browser is Safari and version 11 is the best.",
    "Cate's favorite browser is Edge and version 15 is the best.",
  ]),
  /\w+\'s favorite browser is (\w+) and version (\d+) is the best./
);
const test = "Shanyy's favorite browser is Safari and version 13 is the best.";
const result = V.match(test); // ['Safari', 11]

Init Version with params

const { Version } = require('fallback-version');
const V = new Version('Fake', new Set(['Chrome/10', 'Chrome/50', 'Chrome/60', 'Chrome/65']), /(\w+)\/(\d+)/);
const test = 'Chrome/9';
const result = V.match(test); // ['Fake', 0]

For more detail usage, just take a look at test cases or source code in src.

License

MIT. See LICENSE for details.