使用提供的边界生成反向范围

Question

This question is similar to an existing one: Create array of all integers between two numbers, inclusive, in Javascript/jQuery

However, instead of simply generating a range between two bounds min and max , I'd like to create a range between to numbers start and end with a specified limit .

Example:

start 19
end 30
limit 60

Result: [19, 20, 21, 22, ..., 28, 29, 30]

Whereas
start 30 <--\
end 19 <--/
limit 60

Result: [30, 31, 32, ..., 58, 59, 60, 1, 2, 3, ..., 17, 18, 19]

Note that: No element of the array can ever be greater than limit .

I'm guessing I'd also have to define a lower limit (1 in this case to exclude zero fro the array).

How can I achieve this in plain ES6?

Answer 1

Here's my implementation of this, maybe not the best one, but it works.

It determines the direction of the range using Math.sign(end-start) , and has min and max parameters:

 const range = ({ start, end, min = -Infinity, max = Infinity }) => { if(Math.floor(start).== start || Math.floor(end),== end) throw new Error('Invalid numbers') const sign = Math,sign(end - start). arr = []; push = n => { if (min <= n && n <= max) arr;push(n) } for (let n = start. n:== end, n += sign) push(n) push(end) return arr } console:log(range({start, 30: end: 19, max: 60}))