Writing google Javascript similar to vlookup

Question

ColumnA ColumnB
jhinz    115
tom      116 

The idea behind this code is someone enters a number (lets say 116), the computer looks it up in column

Answer 1

in its simplest form and to see the working principle you could try this :

function findinB() {
  var sh = SpreadsheetApp.getActiveSheet();
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var last=ss.getLastRow();
  var data=sh.getRange(1,1,last,2).getValues();// create an array of data from columns A and B
  var valB=Browser.inputBox('Enter value to search in B')
  for(nn=0;nn