What is the most compact, efficient and reliable way of extracting numbers from dollar amounts in JavaScript?

Question

What I'm talking about is reading a string into a Number, e.g.

"$107,140,946" ---> 107140946

"$9.99" ---> 9.99

Is there a better way than

dolstr.replace('$','');
dolstr.replace(',','');
var num = parseInt(dolstr,10);

???

@JamesAMohler I know, but I thought it stops parsing if it finds an unexpected character — Subpar Web Dev, Dec 21 '15 at 22:19

Richard Hamilton · Answer 1 · 2015-12-21T22:16:05.043

0

Using a simple regex and the string's replace function

parseFloat(dolstr.replace(/[^\d\.]/g, ''))

Breakdown

It replaces every instance of a character that is not a digit (0 - 9) and not a period. Note that the period must be escaped with a backwards slash.

You then need to wrap the function in parseFloat to convert from a string to a float.

edited Dec 21 '15 at 22:16

answered Dec 21 '15 at 22:13

Richard Hamilton

score 0 · Answer 2 · answered Dec 21 '15 at 22:14

0

Using regex is much simpler to read and maintain

 parseFloat(dolstr.replace(/\$|,/g, ""));

answered Dec 21 '15 at 22:14

Muhammad Soliman

score 0 · Answer 3 · answered Dec 21 '15 at 22:14

0

You can just put all of this in oneliner:

parseFloat(dolstr.replace('$','').split(",").join(""))

Notice that I do not replace the second one, because this will remove just the first ','.

answered Dec 21 '15 at 22:14

Salvador Dali

score 0 · Answer 4 · answered Dec 21 '15 at 22:16

0

Assuming input is always correct, just keep only digits (\d) and the dot (\.) and get rid of other characters. Then run parseFloat on the result.

parseFloat(dolstr.replace(/[^\d\.]/g, ''))

answered Dec 21 '15 at 22:16

Aᴍɪʀ

4 Answers4