Google Spreadheets Scripts: check if cell is empty

Question

I want to input a variable in a cell only if the cell is empty. The if statement, however, does not work. Any advice?

var ss=SpreadsheetApp.getActiveSpreadsh         


        

Answer 1

If you already have cell value then use === or !== operators if you want avoid type conversion (where 0 == "" ).

Code snippet for decreasing not empty cell values

var sheet = ss.getSheets()[0];     
var range = sheet.getRange("E2:H5");
var currentValues = range.getValues();  

var newValues = [];
for (var row in currentValues) {
  var newRow = []; 
  for (var col in currentValues[row]) {
    if (currentValues[row][col] !==  "") { // if not empty cell
      newRow[col] = currentValues[row][col] - 1;          
    }
    else {
      newRow[col] = currentValues[row][col];
    }
  }
  newValues[row] = newRow;
}    
range.setValues(newValues);