Increment (and Decrement) values in a [Google Sheet] column

Question

The image (attached) is a simple "AppScript" adapted from a popular YouTube ...that allows "Values" (in a column) to be increased by 1 - by clicking an "Arrow" (button) - that I've linked to the script

By Clicking the "Up" Arrow, all the values will change from 6 ...to 7 (ie: go "Up" by one value)

QUESTION(s): How do I 'adjust' the Script to:

1. Assess (or Evaluate) the Values in the column
2. Ignore any values that are "Zero" (0)
3. Increment (by 1) ...all the other "Non-Zero" values

And finally, if a Value is 'different' than the other values (eg: 5 ...instead of 7)

4. Increment a value of 5 to 6 ...and the 'other' values of 7 to 8

Currently, the Script will change 5 to an 8 (along with all the 7's)

I'd like the Script to change the 5 to a 6 (and the 7's can increment to 8's)

Answer 1

Suggestion:

You can have the script iterate through each of the value of the range and increment it if the value isn't equal to 0.

Do try this script:

function incrementA2A5() {
  var sourceSheet = SpreadsheetApp.getActiveSheet();
  var range = sourceSheet.getRange("A2:A5");
  var values = range.getValues();

  //The forEach loop below iterates through each value of the range.
  //If the value isn't equal to zero, the loop will increment it by one.

  values.forEach(x => x[0] != 0 ? x[0] += 1 : x[0]);

  range.setValues(values); //Sets the updated values on the range
}

.GIF demo of the script: