GAS Split one cell and fill down another - google-apps-script

Question

I have the following situation:
Column G Column H
|Black, Brown, Grey| | dog |
|Calico | | cat |
|Green, Blue | | bird|
| ... | | ... |
I would like to split and fill down to this:
Column G Column H
|Black | |dog |
|Brown | |dog |
|Grey | |dog |
|Calico| |cat |
|Green | |bird|
|Blue | |bird|
|... | | ...|
Looking at the script to split a comma delineated cell (Function to split text in cell and create column) I can follow the split but it's the filling down portion that I am having trouble with. I understand I should set up a while loop with the first cell as var = i and the second cell as var = j. Dump the split contents of i to an array and then fill down the array.length. However, I can't seem to get the syntax correct.
I'm pretty new to JS and GAS so any help would be appreciated.
Thanks for the help.
-JH

Answer 1

Here's a custom function that should work for you:
/**
* Splits the array by commas in the column with given index, by given delimiter
* #param {A2:B20} range Range reference
* #param {2} colToSplit Column index
* #param {","} delimiter Character by which to split
* #customfunction
*/
function advancedSplit(range, colToSplit, delimiter) {
var resArr = [], row;
range.forEach(function (r) {
r[colToSplit-1].replace(/(?:\r\n|\r|\n)(\d|\w)/g,", ").split(delimiter)
.forEach(function (s) {
row = [];
r.forEach(function (c, k) {
row.push( (k === colToSplit-1) ? s.trim() : c);
})
resArr.push(row);
})
})
return resArr.filter(function (r) {
return r.toString()
.replace(/,/g, "")
})
}
This function can be used like this: