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JavaScript

Posted by Will Potter
Will Potter
7,577 Points

Type Error: not a function

So I'm working on writing a function for a coding challenge on another website, and I ran in to this error when testing out my (unfinished) code: "TYPE ERROR: strOne.split() is not a function"

function CountingMinutesI(str) { 
//split times into two strings
 var strOne = str.slice(0, str.indexOf("-"));
  var strTwo = str.slice(str.indexOf("-")+1, str.length+1)
//convert to array
  if (/am/.test(strOne)) {
    strOne -= "am";
    var arrOne = strOne.split(":"); 
   }
  else if (/pm/.test(strTwo)) {
    strTwo -= "pm";
    var arrTwo = strTwo.split(":");
  }
  //convert to military time       
}
Will Potter
Will Potter
7,577 Points

Never mind, I figured it out. Although you can use += to add content to a string, you can't use -= to remove content from a string. When I did, it changed strOne's type from string to NaN. I still don't really understand why. But anyway, if this ever happens to you, just use the replace method. In my case, strOne.replace("am", ""). You can replace whatever value in your string with nothing, which is the same as removing it.