how do you call a function in javascript until two buttons are clicked before the fuction executes?

Question

click on two buttons before the function is called

Answer 1

var flag1, flag2;

btn1.onclick = () => {
flag1 = true;
if (flag2) myfunc();
};
btn2.onclick = () => {
flag2 = true;
if (flag1) myfunc();
};

Answer 2

Francis Woli obviously, you need to reset both flags (in function called or in if block) to false for enabling multiple calls...

Answer 3

PSEUDOCODE
-----------------------
btn1.onClick keyOne = true
btn2.onClick keyTwo = true

if(keyOne && keyTwo)
callYourFunction()

Answer 4

how do apply it to event listeners?