Published Jun 18 2020
I had a problem: I had a string that contained a decimal number, but the user could write it in two ways, using a dot, or a comma:
Different countries use different ways to separate the integral part from the decimal part of a number.
So I decided to convert the string to using a dot whenever I found a comma.
I used a simple regular expression to do that:
let value = '0,32' value = value.replace(/,/g, '.') //value is now '0.32'
You can do the opposite using
replace(/\./g, ',') (note the
\ before the
. to escape it, since it’s a special character in regular expressions)
g flag in the regex makes sure that if there are multiple instances of a comma (or dot, in the second example) they are all converted.
This is not something that applies to our use case, and I think we need to do more validation to check the integrity of our input here, but it’s a start.
In my case, after doing this substitution I called parseFloat(value) to get the float from the string, and then I limited the decimals number to 2 using toFixed(2):
value = parseFloat(value).toFixed(2)
I wrote an entire book on this topic 👇
I also got a super cool course 👇