dart null aware operators
int minVal = (a < b) ? a : b; // if(a < b) {minVal = a;} else {minVal = b;}
var x = y ?? z; // assign y to x if y is not null, else z
var x ??= y; // assign y to x only if x is null
myObject?.myProp // (myObject != null) ? myObject.myProp : null
myObject?.myProp?.someMethod() // chainabledart nullable variable
// type? variable; variable can be null.
int a?; // a can be null
e1?.[e2] // null if e1 is null; otherwise it’s e1[e2]
/* This requires the 'non-nullable' language feature to be enabled.
In pubspec.yaml, set the minimum SDK constraint to 2.12.0 or higher
and running 'pub get'. */
environment:
sdk: ">=2.12.0 <3.0.0"Copyright © 2021 Codeinu
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