range
Return an array with numbers either ascending or descending.
Installation
npm install --save --save-exact @tmurphree/range
Basic usage
// [1, 2, 3]
range(1, 3);
// goes down, too
// [4, 3, 2]
range(4, 2);
// returns a one-item array if start === end
// [42]
range(42, 42);More realistic usage
Useful as a starting point for Array.map. E.g. with Promise.all and paging:
const axios = require('axios');
const getAllPages = (lastPageNumber) => return Promise.all(
range(1, lastPageNumber) // [1, 2, 3, 4, . . . all the way to lastPageNumber]
.map((pageNumber) => `https://api.foo.com/getReports?key=${process.env.KEY}&page=${pageNumber}`)
.map(axios.get)
);
getTotalPages()
.then(getAllPages)
.then(doSomethingUseful)
.catch(myGreatErrorHandler);