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Error Handling Help


chob1234
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I am needing to convert an String input into an Integer.  But before converting the String input, i have to do a validation that the String input can be converted to a numeric value. So If it cannot, i need to log a message saying “This cannot”.  Then log another new log statement on the next line saying “be a number”. I understand I need a parseInt and isNan and if else statements but I am confused on exactly how they are implemented. I am new to javascript. 

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You could create a function to check if the number can be converted.

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

Then all you need to do is

if(isNumeric(someNumber)) {
  //You have a number
} else {
  //You don't have a number
}

Implement parseInt as required.

Use console.log as specified in your post.

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19 hours ago, Funce said:

You could create a function to check if the number can be converted.


function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

Then all you need to do is


if(isNumeric(someNumber)) {
  //You have a number
} else {
  //You don't have a number
}

Implement parseInt as required.

Use console.log as specified in your post.

So I came up with this:

function isNumeric(string) {
  return !isNaN(parseInt(string)) && isFinite(string);
}

if(isNumeric(parseInt <= 10000)) {
  //You have a number
logger.debug("You have a number")

} else {
  //You don't have a number
  logger.debug("This cannot be a number")
}

It only outputs "This cannot be a number"

What am I doing wrong?

I am logging in Thingworx so that is where the logger.debug is coming from.

Edited by chob1234
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6 minutes ago, justsomeguy said:

 


if(isNumeric(parseInt <= 10000)) {

 

What exactly are you trying to do there?  parseInt is a function, why are you trying to check if a function is less than or equal to 10000?

Yeah I am not sure exactly, I guess the goal is to convert the string input to an int, but confused.

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