toDeltaString method
The delta string representation of this num (showing always the positive sign).
Example:
1.1.toDeltaString() == '+1.1'
0.toDeltaString() == '+0'
(-5).toDeltaString() == '-5'
Implementation
String toDeltaString({bool useAscii = false}) => isNegative
? (useAscii ? '$this' : toNegativeUnicode())
: '$plusSign$this';