Creating a parser w/o JSON.parser

Question

I am trying to create a function that parses JSON text.

function JSONParser(string) {
  //CODE HERE
  string = string.replace(/"/g, "");

  var obj = {};
  obj[0] = string;
  string = obj[0].replace(/'/g, "");

  return string;
}

I only did the funky thing with the object because .replace didn't seem to work directly on the string the second time.

When I run this code through a checker. I get...

JSONParser(JSON.stringify(true));
"true"

I am aiming to return the boolean true and not a string.

Does anyone know why I still get a return with double quotes? Is there more to changing a string object than removing the quotes? Or, am I simply trying to remove them incorrectly?

Any help would be greatly appreciated. TIA

-Lea

user1106925 · Accepted Answer · 2015-11-23 00:11:10Z

Because it's still a string, so the console displays it with quotes (as decoration).

Remember, when you do var foo = "true", the quotes aren't actually part of the string, so there's no need to remove them. Your console just shows them as a way to indicate the type of data it's showing. They're not actually there.

If you want a boolean, you can do something like this:

function JSONParser(string) {
  return string === "true" ? true :
         string === "false" ? false : string;
}

console.log(JSONParser(JSON.stringify(true)));

If the string is neither "true" nor "false", it just returns the original string.

If you prefer if statements, then:

function JSONParser(string) {
  if (string === "true") {
    return true;
  } else if (string === "false") {
    return false;
  } else {
    return string;
  }
}

console.log(JSONParser(JSON.stringify(true)));

Or a switch statement would be useful too.

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