The result I get now gives me blank when that character is not there:
Code
const categories = catSubSheet.getRange(2, 1, catSubSheet.getLastRow() - 1, 3).getValues();
let categories1 = categories.filter(e => e[0] != '').map(function (e) { return e[0] });
let sheetsToProcess = [];
for (let a = 0; a < categories1.length; a++) {
sheetNames = categories1[a].substring(0, categories1[a].indexOf(" ("));
sheetsToProcess.push('BOQ ' + sheetNames)
}
Data
[
[GF HTG SHEET 1 (Drawing)],
[GF HTG SHEET 2 (Drawing)],
[GF DWS SHEET 1],
]
The result
Sheets to Process: BOQ GF HTG SHEET 1,BOQ GF HTG SHEET 2,BOQ
Expected Result
Sheets to Process: BOQ GF HTG SHEET 1,BOQ GF HTG SHEET 2,BOQ GF DWS SHEET 1
As a quick fix you can try this:
...
let sheetsToProcess = [];
for (let a = 0; a < categories1.length; a++) {
var index = categories1[a].indexOf(" (");
if (index > -1) { sheetNames = categories1[a].substring(0,index) }
else { sheetNames = categories1[a] }
sheetsToProcess.push('BOQ ' + sheetNames)
}
...
But actually it can be done in more neat way.
Something like this:
var categories1 = [
'GF HTG SHEET 1 (Drawing)',
'GF HTG SHEET 2 (Drawing)',
'GF DWS SHEET 1'
];
var sheetsToProcess = categories1.map(x => 'BOQ ' + x.replace(/ \(.+$/, ''));
console.log(sheetsToProcess); // [ 'BOQ GF HTG SHEET 1', 'BOQ GF HTG SHEET 2', 'BOQ GF DWS SHEET 1' ]