What's does a bash function return when there is no “return” statement?

Is the return value of a bash function the status of the last executed command?

I wrote this test and it looks like it's so. I just want to verify. No one has asked this question before apparently and tutorials don't mention this.

Test program:

funa() {  echo "in funa";  true;};funb() {  echo "in funb"  false;};funa && echo "funa is true";    funb && echo "funb is true";

Output when I run the program:

in funafuna is truein funb

Does anyone know the answer?