Prevent variable declaration using try-catch blocks

Question

Prevent variable declaration using try-catch blocks

I am currently working on a code that aims to retrieve a path value from an XML file. If the path is not found, I want to set it to blank.

Interestingly, I encounter errors when I use try/catch blocks, stating that the "path" cannot be found. However, when I remove the try/catch, the path is found without any issues. Is there something specific about try/catch that I might be overlooking?

Another point to mention is that I am using try/catch because when I attempt to set my code variable, an error occurs if the path is not found. I am looking for a solution where if the path is not found, it will simply be blank and the program will continue running.

Thank you for any insights!

for (i = 0; i<listLength; i++){ 
    var path = msg['section']['organizer']['site'][i]['section']['code']['@code'].toString()

    if (path == "1234-5"){

        for (x = 0; x<count; x++){
            try{
                var code = msg['component']['structuredBody']['component']['section']['entry'][x]['act']['entryRelationship'][0]['observation']['participant']['participantRole']['playingEntity']['code']['@code'].toString()
            }
            catch(err){
                code = ""
            }

javascript xml

Answer 1

Answer №1

Make sure to define the code variable outside the try catch block.

var code;
try {
  code = mgs...;
} catch () {
  code = '';
}

Another approach is to avoid using a try catch and instead retrieve the property in a loop. Here is an example:

function accessPropertyValue(obj, prop) {
  var keys = prop.split(".");
  return keys.reduce((acc, key) => {
    if (!acc) return acc;
    return acc[key];
  }, obj);
}

var obj = {
  a: {
    b: {
      c: [{
        d: 42
      }]
    }
  }
};

console.log(accessPropertyValue(obj, "a.b.c.0.d"))

Answer 2

Make sure to define the code variable outside the try catch block.

var code;
try {
  code = mgs...;
} catch () {
  code = '';
}

Another approach is to avoid using a try catch and instead retrieve the property in a loop. Here is an example:

function accessPropertyValue(obj, prop) {
  var keys = prop.split(".");
  return keys.reduce((acc, key) => {
    if (!acc) return acc;
    return acc[key];
  }, obj);
}

var obj = {
  a: {
    b: {
      c: [{
        d: 42
      }]
    }
  }
};

console.log(accessPropertyValue(obj, "a.b.c.0.d"))

Prevent variable declaration using try-catch blocks

Answer №1

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