In JavaScript, how to access object properties inside an array of object?

Question

I have the following array of object and I am trying to access tester transaction's amount and status?

I am able to display company's and project's name via the following:

transactions.map((transaction, index) => {
    console.log(transaction.company_name)
    console.log(transaction.project_name)
})

How would I display the status and the amount which is part of tester_transaction object?

Answer 1

You can access .tester_transaction object and its properties directly from transaction (and check if tester_transaction is defined):

transactions.map((transaction, index) => {
    console.log(transaction.company_name)
    console.log(transaction.project_name)

    if (transaction.tester_transaction !== undefined) {
      console.log(transaction.tester_transaction.status)
      console.log(transaction.tester_transaction.amount)
    }
})

Answer 2

transactions.map((transaction, index) => {
    if(transaction.hasOwnProperty("company_name")){
       console.log(transaction.company_name);
    }
    if(transaction.hasOwnProperty("company_name")){
       console.log(transaction.project_name);
    }
    if(transaction.hasOwnProperty("tester_transaction")){
       console.log(transaction.tester_transaction.amount);
    }
    if(transaction.hasOwnProperty("tester_transaction")){
       console.log(transaction.tester_transaction.status);
    }
});

Don't forget to check for that the property exists.

Answer 3

    transactions.map((t) => {
    console.log(t. tester_transaction.amount)
  console.log(t.status)
})

Answer 4

This code violates the use of Map.

Read more about map: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

Please use simple for of.. loop as your purpose is to just fetch the value and print it.

for(const transaction of transactions) {
  console.log(transaction.company_name || '');
  console.log(transaction.project_name || '');

  if(!transaction. tester_transaction)
    continue;

  console.log(transaction.tester_transaction.amount || '');
  console.log(transaction.tester_transaction.status || '');
}