override

Compares this to `other`

.

Returns a negative number if `this`

is less than `other`

, zero if they are equal, and a positive number if `this`

is greater than `other`

.

The ordering represented by this method is a total ordering of num values. All distinct doubles are non-equal, as are all distinct integers, but integers are equal to doubles if they have the same numerical value.

For doubles, the `compareTo`

operation is different from the partial ordering given by operator==, operator< and operator>. For example, IEEE doubles impose that `0.0 == -0.0`

and all comparison operations on NaN return false.

This function imposes a complete ordering for doubles. When using `compareTo`

the following properties hold:

- All NaN values are considered equal, and greater than any numeric value.
- -0.0 is less than 0.0 (and the integer 0), but greater than any non-zero negative value.
- Negative infinity is less than all other values and positive infinity is greater than all non-NaN values.
- All other values are compared using their numeric value.

Examples:

print(1.compareTo(2)); // => -1 print(2.compareTo(1)); // => 1 print(1.compareTo(1)); // => 0 // The following comparisons yield different results than the // corresponding comparison operators. print((-0.0).compareTo(0.0)); // => -1 print(double.nan.compareTo(double.nan)); // => 0 print(double.infinity.compareTo(double.nan)); // => -1 // -0.0, and NaN comparison operators have rules imposed by the IEEE // standard. print(-0.0 == 0.0); // => true print(double.nan == double.nan); // => false print(double.infinity < double.nan); // => false print(double.nan < double.infinity); // => false print(double.nan == double.infinity); // => false

int compareTo(num other);

© 2012 the Dart project authors

Licensed under the Creative Commons Attribution-ShareAlike License v4.0.

https://api.dart.dev/stable/2.5.0/dart-core/num/compareTo.html