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dart null aware operators

A-312 
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()  // chainable
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3.83
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Krish 100200 points 

                                    print(1 ?? 3); // &lt;-- Prints 1.
print(null ?? 12); // &lt;-- Prints 12.

int a; // The initial value of a is null.
a ??= 3;
print(a); // &lt;-- Prints 3.

a ??= 5;
print(a); // &lt;-- Still prints 3.

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