How to modify arrayFormula and vlookup in Google Apps Script - google-apps-script

Question

Hi I'm just new in Google Apps Script. I want to modify this formula below to Google Apps Script
=arrayFORMULA(iferror(VLOOKUP(J3,{'WO SR 22/23'!P:P,'WO SR 22/23'!B:B},2,FALSE)))
The lookup value is in wsPetitionStatusReport sheet. I tried code below but it always return null. Can you help me with this? Thank you so much
function vLookUpVALUE() {
const ss = SpreadsheetApp.getActiveSpreadsheet();
const wsWOSR = ss.getSheetByName("WO SR 22/23")
const wsPetitionStatusReport = ss.getSheetByName("Petition Status Report ")
const searchVALUES = wsPetitionStatusReport.getRange("J3:J").getValues()
const wsWOSRDATcolO = wsWOSR.getRange("B3:P" + wsWOSR.getLastRow()).getValues();
const matchDATAcolO = searchVALUES.map(searchROWcolO => {
const matchROWcolO = wsWOSRDATcolO.find (r => r[0] == searchROWcolO[0])
return matchROWcolO ? [matchROWcolO[0]] : [null]
})
console.log(matchDATAcolO)
}

Answer 1

You can evaluate the array formula for the whole column by replacing J3 with an open-ended reference like J3:J:
=arrayformula(iferror(vlookup(J3:J, { 'WO SR 22/23'!P:P, 'WO SR 22/23'!B:B }, 2, false)))
To do the same with Apps Script, use something like this:
function vlookupLookAlike() {
const ss = SpreadsheetApp.getActive();
const source = {
values: ss.getRange('WO SR 22/23!B3:P').getValues(),
keyColumn: 14, // =column(P3) - column(B3)
dataColumn: 0,
};
source.keys = source.values.map(row => row[source.keyColumn]);
source.data = source.values.map(row => row[source.dataColumn]);
const target = {
range: ss.getRange('Petition Status Report !J3:J'), // trailing space
};
target.keys = target.range.getValues().flat();
target.results = target.keys.map(key => [key && source.data[source.keys.indexOf(key)]]);
target.range.offset(0, 5).setValues(target.results);
}