JavaScript | string - boolean type conversion

by Zoltan Boros

HTML

<p>Empty string is converted to boolean false, however boolean false is converted to string "false".</p>
<pre id="out"></pre>

JavaScript

var out = document.getElementById("out");
function print(string)
{
    out.innerHTML += string + "\n";
}

var x = "";
print("Value: [" + x + "] (" + typeof x + ")");
x = Boolean(x);
print("Value as boolean: [" + x + "] (" + typeof x + ")");
x = x.valueOf();
print("Its primitve value: [" + x + "] (" + typeof x + ")");

x = false;
print("Value: [" + x + "] (" + typeof x + ")");
x = x.toString();
print("Value as string: [" + x + "] (" + typeof x + ")");

x = false;
if (x == "") {
    print('[' + x + '] (' + typeof x + ') equals to ""');
} else {
    print('[' + x + '] (' + typeof x + ') does NOT equal to ""');
}

x = "";
if (x == false) {
    print('[' + x + '] (' + typeof x + ') equals to false');
} else {
    print('[' + x + '] (' + typeof x + ') does NOT equal to false');
}