if ( teacher == null ) { return; }
if ( teacher != null )
{
}
console.log("a = " + a)
console.log(a ? "true" : "false")
if ((!a) || a == "") {
}
if ( teacher == null ) { return; }
if ( teacher != null )
{
}
console.log("a = " + a)
console.log(a ? "true" : "false")
if ((!a) || a == "") {
}