Questions from JS challenges!

Question

1. alert(typeof ('bird' != 'cat'))
Why answer is 'boolean'?

2. var y = true;
var x = y || 1;
alert(x)
Why answer is true?

3. console.log(false + 7)
Why answer is 7?

4. var x = 8;
var a = (x++) % 3;
document.write(a);
The (x++) is it equal to 8?

Answer 1

1: typeof 'bird'!='cat
'bird'!='cat is a boolean comparison that returns true since 'bird' is not 'cat'
and 'true' is of type boolean
2: var x=true|1;
true|1 returns the first truthy value in the sequence.true is the first truthy value so its returned;
3:false+7
false converted to a number has a value if 0,thus 0+7=0
4:x++ is post incrementation.the value of x is used on that line,then incremented on the other.
++x will yield 9
goodday

Answer 2

Thanks for your explanation!