CODEWITHSUNDEEP
regexflutterparsingdouble
Rami Dhouib
Rami Dhouib

Reputation: 11

How to know which numbers after . are non trailing zeros

I have, for example, 123.54054000. I want a function that returns 5, which is the number of decimals that I shouldn't ignore. I want to remove trailing zeros in my app.

Examples:

For 1.010 returns 2

for 1.7000 returns 1

for 1.123405607000 returns 9.

Upvotes: -1

Views: 66

Answers (2)

sln
sln

Reputation: 2759

Since its text, you could use a regex to do the 0 trimming :

(\.(?:[0-9]*[1-9])?)0+

replace $1

https://regex101.com/r/kmYNO0/1

(                             # (1 start)
   \. 
   (?: [0-9]* [1-9] )?
)                             # (1 end)
0+

Upvotes: 0

ABDELAZIZ RASS
ABDELAZIZ RASS

Reputation: 71

Convert the number to a string and use this function; it will return the number you want:

int countSignificantDecimals(String number) {
  String trimmed = number.replaceFirst(RegExp(r'0+$'), '');
  
  int decimalIndex = trimmed.indexOf('.');
  if (decimalIndex == -1) {
    return 0;
  }
  return trimmed.length - decimalIndex - 1;
}

Upvotes: 0

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