Range

Generate an array of integers, inclusive of start and end values.

Be aware that this does not work with floats, and is rather slow.

Instructions

Install

yarn install @erikwatson/range

Use it like this

const range = require('@erikwatson/range')

range(start, end, step) // specify everything
range(start, end)       // same as range(start, end, 1)
range(end)              // same as range(0, end, 1)

If you specify only one argument, the function assumes that you want to start from 0, and the first argument is then treated as an "end" instead of a "start".

range(5)        // [0, 1, 2, 3, 4, 5]
range(1, 5)     // [1, 2, 3, 4, 5]
range(-2, 2)    // [-2, -1, 0, 1, 2]
range(2, -2)    // [2, 1, 0, -1, -2]
range(0, 10, 2) // [0, 2, 4, 6, 8, 10]
range(0, 10, 3) // [0, 3, 6, 9]
range(10, 10)   // [10]

Tests

We use Jest for testing, it's installed locally but we have a test and watch command set up.

yarn test
yarn watch

Who wrote it

• Erik Watson