[JavaScript] NVL, NVL2

function nvl(expr1, expr2) {
    if (expr1==null || expr1===undefined || expr1=="") {
        expr1 = expr2;
    }
    return expr1;
}

function nvl2(expr1, expr2, expr3) {
    if (expr1==null || expr1===undefined || expr1=="") {
        expr1 = expr3;
    } else {
        expr1 = expr2;
    }
    return expr1;
}