Function similar to vlookup: Why doesn't my indexOf work?

Question

If I would like to match the word that I need to find it the same as in Excel. I intend to create a form for Example. I have a file certain big d

Answer 1

data is a 2D(two dimensional) array. indexOf only works with a 1D array. flatten the array before indexOf:

const data = [["A1"],["A2"],["TPBSA"],["A4"]];
console.info(data.flat().indexOf("TPBSA"));
//or
console.info(data.findIndex(e=>e[0]==='TPBSA'))