What does this code tell computer to do lights[k] = !lights[k];?

Question

what does this code tells the computer to do? Ps The 'lights' is a boolean array.

for (int k = 1; k < lights.length; k++)
                lights[k] = !lights[k];

Answer 1

It's basically toggling the boolean flags in the array (except the first one). A true flag will be set to false and vice-versa.

Note that any uninitialized items of a boolean array will be false in Java.

 const lights = [false, false, false]; //toggling flags except the first one for (let k = 1; k < lights.length; k++) lights[k] = !lights[k]; console.log(lights);