Converts x
to a double and returns the positive square root of the value.
Returns -0.0 if x
is -0.0, and NaN if x
is otherwise negative or NaN.
external double sqrt(num x);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-math/sqrt.html