How to get results of a custom google sheet function in cells - google-apps-script

Question

I am trying to get results of following function in cells in google sheet.
I can get the results in script log but i need it in cells .. can someone add to this syntax so that its results can be placed in cells.
function scrapeDemo(url) {
var html = UrlFetchApp.fetch(url).getContentText();
var res = html.match(/<div class="cr_data rr_stockprice module">.+?(<table .+?<\/table>)/);
var document = XmlService.parse(res[1]);
var root = document.getRootElement();
var trNodes = root.getChild('tbody').getChildren();
trNodes.forEach((trNode) => {
var tdNodes = trNode.getChildren();
var fieldName;
var fieldValue;
tdNodes.forEach((tdNode, idx) => {
if (idx % 2 === 0) {
fieldName = tdNode.getValue().trim();
} else {
fieldValue = tdNode.getValue().trim();
console.log( fieldName + " : " + fieldValue );
}
} );
} );
}
I am trying to get the result that are currently available in script log in cells. When I put scrapeDemo(url) in a cell It should give the data. It can be as a table with Fieldnames in one column and Fieldvalue in next column.

Answer 1

The script in the question body doesn't include a return statement, but A Google Sheets custom function should have one returning a value / object supported by Google Sheets (number, string, boolean, date, or an Array of Arrays of supported values/objects), example:
/**
* If a and b are numbers these values will be added
* If a or b are strings the these values will be concatenated
*/
function myFunction(a,b){
return a + b;
}
/**
* Returns a Matrix of X having rowNum by colNum
*
*/
function XMATRIX(rowNum,colNum){
var output = [];
for(var i = 0; i < rowNum; i++){
output[i] = [];
for(var j = 0; j < colNum; j++){
output[i][j] = 'X';
}
}
return output
}
Resources
https://developers.google.com/apps-script/guides/sheets/functions

Answer 2

If you have a range or want to build a range of data and you are executing your script in a google sheet, you can do it like:
var sheet = SpreadsheetApp.getActive().getSheetByName("NameOfTheSheet");
sheet.getActiveCell("A1").setValues(valueRange);
If you want to write value by value on its own. Use:
var sheet = SpreadsheetApp.getActive().getSheetByName("NameOfTheSheet");
sheet.setActiveRange("A1").setValues(value);
if you want to iterate in the Cells, then use:
...
sheet.setActiveRange("A" + i).setValues(value);
i++;
...