If var isnumber, for script

Question

I need to run a script which contains the logic: If isNumber, Then DoSomething.

I\'ve run other such if then tests such as if blank, and if cell contains \"

Answer 1

This will check if A1 is a number:

function ifIsNumber() {
    var ss = SpreadsheetApp.getActiveSpreadsheet();
    var s = ss.getActiveSheet();
    var substring1 = s.getRange("A1").getValue();
    if (!isNaN(parseFloat(substring1)) && isFinite(substring1)) {
        s.getRange("B1").setValue("Is a number");
    } else {
        s.getRange("B1").setValue("Not a number");
    }
}