Question

Apoligies for my basic understanding of jQuery. I am trying to write a function that can have values set by the user or left blank, set themselves. It looks like this:

// Calendar
function eventCalendar(yearSet, monthSet) { 

    // Get current date
    var date = new Date();

    // Check to see if variables were set in function

    // Year
    if ((yearSet.length > 0)) {
            var year = yearSet;
        } else {
            var year  = date.getFullYear();
        }

    // Month
    if ((monthSet.length > 0)) {
            var month = monthSet;
        } else {
            var month = date.getMonth();
        }

    console.log(month + ', ' + year);   
}

However when the function is called without variables, console sends me the error:

‘yearSet is undefined’

How do I get around this?

Answer 1

if(yearSet && yearSet.length) {
   //..
}

You can simplify your method like this.

function eventCalendar(yearSet, monthSet) { 
  var date = new Date();
  //if yearSet is present it will get that or else from new Date
  var year = yearSet || date.getFullYear();
  //if monthSet is present it will get that or else from new Date
  var month = monthSet || date.getMonth();

  console.log(month + ', ' + year);   
}