How to separate each sub group in main group Array using javascript

Question

I have an Array. It contains several subgroups. Example:

let mainArray=[50,51,52,53,54,511,512,513,514,521,522,523,524,525,526,527]

I want

Answer 1

Here's a solution using Ramda.js

const x = [50,51,52,53,54,511,512,513,514,521,522,523,524,525,526,527]

const f = R.pipe(
  R.sortBy(R.identity), 
  R.groupWith(R.pipe(R.subtract, Math.abs, R.equals(1)))
)

console.log(f(x))