Removing double double quotes for Javascript

My problem involves a string that represents longitude/latitude in the format of dd°mm'ss''W (note 2 single quotes after ss).

To convert this string into its decimal representation, I am using the following code snippet:

function dmsTodegrees(val) {
    var s = val.replace('°', ' ');
    s = s.replace("'", ' ');
    s = s.replace("''", ' '); 
    var tokens = s.split(' ');
    var result = Number.parseFloat(tokens[0]) + Number.parseFloat(tokens[1]) / 60 + Number.parseFloat(tokens[2]) / 3600;
    if (tokens[3] === 'W' || tokens[3] === 'S') result = -result;
    return result;
}

However, it appears that s = s.replace("''", ' '); is not functioning as expected, as the two single quotes (') are not being replaced. I am unsure of what mistake I might be making.

Please note that error handling has been omitted in the provided code.

javascript

Answer №1

Using /'{1,2}/g allows you to replace all occurrences of single quotes in the given string. If you wish to replace all single quotes without considering the quantity, you can simply use /'+/g

function convertDegrees(val) {
   var s = val.replace('°', ' ');
   s = s.replace(/'{1,2}/g, ' ');

   return s;
}

console.log(convertDegrees("dd°mm'ss''W"));

Answer №2

Are you attempting to replace special characters like °, ', and '' with spaces in order to split the string into separate tokens? Rather than removing these characters and then splitting the string by space, why not just split it directly?

...
var tokens = val.split(/°|'{1,2}/);
...

This method functions as follows:

"12.34°56.78'90.12''W".split(/°|'{1,2}/)
=> (4) ["12.34", "56.78", "90.12", "W"]

Answer №3

When looking at the following code:

s = s.replace("'", ' ');
s = s.replace("''", ' ');

The first line is replacing every single quote "'" with a space, which means the second line will never find two quotes together.

However, it's important to note that the replace method only works on the first occurrence it finds.

Therefore,

"1,2,3,'',4,'',5,''".replace("'", " ").replace("''", ' ')

will result in

"1,2,3, ',4, ,5,''"

It's recommended to refer to @Dij's response for a more efficient solution.

Answer №4

My recommendation would be to utilize single quotation marks (') with escape sequences(\') inside of them when using the replace function.

function dmsTodegrees(val) {
    var s = val.replace('°', ' ');
    s = s.replace('\'', ' ');
    s = s.replace('\'\'', ' ');
console.log(s);
    var tokens = s.split(' ');
    var result = Number.parseFloat(tokens[0]) + Number.parseFloat(tokens[1]) / 60 + Number.parseFloat(tokens[2]) / 3600;
    if (tokens[3] === 'W' || tokens[3] === 'S') result = -result;
    return result;
}
console.log(dmsTodegrees("20°10'30''4"));

Answer №5

Before making any further replacements, ensure you first replace two single quotes with a space and then one single quote with another space. If you replace the single quotes in the wrong order, you might unintentionally turn two single quotes into two spaces, like what happened to you.

s = s.replace("''"," ");
s = s.replace("'"," ");

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