How do I use booleans with conditional statements in javascript?

Question

This case I want it when 7 is typed it should show can’t use such name but when other numbers are typed it should show wick

<label>nme</label>
<input id="o" type="number" placeholder="your name" required> <button onclick="f()" >
calculate
</button>

function f() {
var o = 7;
document.getElementById("o").value;
if (o == 7) {
alert("cant you such name");
}
else if (o === 7 ) {
alert ("wick");
}
else {
alert("leave");
}
}

Answer 1

Thanks , it worked

Answer 2

How do I use alphabet instead of numbers ?

Answer 3

how can we replace if statement blocks with boolean?

Answer 4

like boolean in python. and, or, not in place of if and elif. so can we do that?