How to get fractional part in dart

There is a truncate() function for double type which returns the integer part discarding the fractional part. We can subtract that from the original double to get the fraction.

double myDouble = 4734.602654867;
double fraction = myDouble - myDouble.truncate();
print(fraction);                                   // --> prints 0.602654867

Edit: If we want 4 digits specifically from the fractional part, we can do this..

int result = (fraction*10000).truncate();  
print(result);                                    // --> prints 6026

To do all this one line, we can do it like this..

int result = ((myDouble - myDouble.truncate())*10000).truncate(); // <-- 6026

Something like

import 'dart:math' show pow;
var number = 4734.602654867;
var wantedDigits = 4;
var fraction = (number % 1 * pow(10, wantedDigits)).floor();
print(fraction);

should work.

Dartpad example.

You can do that using split()

Like this..

var s = 4734.602654867;
var a = s.toString().split('.')[1]. substring(0,4); // here a = 6026

Hope it solves your issue..

final double number = 4734.602654867;
final String result = number.toStringAsFixed(5).split('.').last.substring(0,4);

void main() {
  double d = 4734.602654867;
  print(((d - d.floor()) * 10000).floor()); // --> prints 6026
}

floor method returns the decimal part of the number

I got a simpler and straight forward answer, especially if you want to still use the fractional part as decimal, and not as a string

` double kunle=300.0/7.0; // the decimal number

int s=kunle.floor(); // takes out the integer part

double fractionalPart=kunle-s; // takes out out the fractional part

print(fractionalPart); // print the fractional part }`