Neo4j transaction with array of queries with js-neo4j-driver - neo4j

Question

I want to pass an n-number of cypher-queries to a neo4j-transaction and I am thinking about a good approach.
At the moment I have a working approach that takes the array-item or if it is not available a dummy-query. (Code below)
I believe this is not best-practice. Does anybody know or have an idea how this can be done better?
function Neo4jTransaction(QueryArray) {
const session = driverWrite.session();
const tx = session.beginTransaction();
tx.run(QueryArray[0] || "RETURN 0")
tx.run(QueryArray[1] || "RETURN 0")
tx.run(QueryArray[2] || "RETURN 0")
tx.run(QueryArray[3] || "RETURN 0")
.then(result => {
return tx.commit()
}).then(() => {
session.close()
driverWrite.close()
}).catch(exception => {
console.log(exception)
session.close()
driverWrite.close()
})
}

Answer 1

First, if you have an array, you might want to iterate over it. Second, tx.run() returns a Promise that you need to catch if it fails. In your code, it is called 4 times in a row, but only the last one waits for the result and catches the error. I looks like some lines of the code are missing.
neo4j-driver documentation gives a good example on explicit transactions: https://github.com/neo4j/neo4j-javascript-driver#explicit-transactions
The queries are executed sequentially. If one fails the whole transaction will be rolled back.
async function neo4jTransaction(queryArray) {
const session = driver.session();
const txc = session.beginTransaction();
try {
for (const query of queryArray) {
await txc.run(query || 'RETURN 0');
}
await txc.commit();
} catch (e) {
await txc.rollback();
return Promise.reject(e);
} finally {
await session.close();
}
}