I recently came across a code sample in the book You Don't Know JS: Scope & Closures that is puzzling to me.
"Function declarations that appear inside of normal blocks typically hoist to the enclosing scope, rather than being conditional as this code implies:"
foo(); // "b"
var a = true;
if (a) {
function foo() { console.log( "a" ); }
}
else {
function foo() { console.log( "b" ); }
}
What does it mean? How is it even possible? Is the conditional not working?
The phenomenon occurs due to the way function declarations are elevated to the top of the file by the JavaScript parser, a process known as hoisting. As a result, the final declaration of foo takes precedence over the initial one when they are hoisted.
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