Array splitting based on value

Question

How could I split an array by value like this:

[0, 1, 2, 0, 0, 0, 1, 0] => [[0, 1, 2], [0], [0], [0, 1], [0]]?

I'm using lodash documentary, but kinda out of ideas for now. Is there any way to do this with _.groupBy? Thanks for your answers.

Answer 1

Use native JavaScrip Array#reduce method.

var data = [0, 1, 2, 0, 0, 0, 1, 0],
  last;

var res = data.reduce(function(arr, v) {
  // check the difference between last value and current 
  // value is 1
  if (v - last == 1)
    // if 1 then push the value into the last array element
    arr[arr.length - 1].push(v)
  else
    // else push it as a new array element
    arr.push([v]);
  // update the last element value
  last = v;
  // return the array refernece
  return arr;
  // set initial value as empty array
}, [])

console.log(res);