How to Correctly Parse Strings with Comma Thousand Separators using JavaScript?

Parsing a String with a Comma Thousand Separator

Question:

When parsing a string with a comma thousand separator using parseFloat, the resulting number may be different from the expected value. How can this issue be resolved?

Answer:

To correctly parse a string with a comma thousand separator, the commas must be removed before conversion to a number. This can be done using a regular expression to replace all occurrences of commas with an empty string.

For example:

let output = parseFloat("2,299.00".replace(/,/g, ''));
console.log(output); // Outputs: 2299

In this example, the regular expression /,/g matches all commas in the string, and the replace method replaces them with an empty string. The resulting string is then converted to a number using parseFloat to produce the correct output.

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