Question

var foo=[0];
if(foo) alert('first');
if(foo==true) alert('second');

Tell me please, why the second alert doesn’t work? In first alert foo casts to Boolean, so

Boolean(foo);
//true

If “foo” is “true”, why doesn’t the second alert work?

Answer 1

Here,

if( foo) alerts because foo isn’t null and the condition evaluates to true.

However, this doesn’t mean that foo itself is equal to true, hence the second alert doesn’t show.