Assignment operators

As you've already seen, you can assign values using the = operator. To assign only if the assigned-to variable is null, use the ??= operator.

// Assign value to a
a = value;
// Assign value to b if b is null; otherwise, b stays the same
b ??= value;

Compound assignment operators such as += combine an operation with an assignment.

=	*=	%=	>>>=	^=
+=	/=	<<=	&=	|=
-=	~/=	>>=

example:

var a = 2; // Assign using =
a *= 3; // Assign and multiply: a = a * 3
assert(a == 6);