How do we use the not ! operator

Question

Pls give an example

Answer 1

Converts the operand to boolean type: true/false.
Returns the inverse value.
For instance:
+ alert( !true ); // false
+ alert( !0 ); // true

Answer 2

for example, you need to output a range of numbers in the loop from -3 to 3, except 0. write:
for (i= -3, 3, i++) {
if (i==!0){
console.log(i);
}
}