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  • Question
  • What is an error-first callback ?


  • Correct Answer
  • Error-first callbacks are used to pass errors and data as well You have to pass the error as the first parameter, and it has to be checked to see if something went wrong Additional arguments are used to pass data fsreadFile(filePath, function(err, data) { if (err) { // handle the error, the return is important here // so execution stops here return consolelog(err) } // use the data object consolelog(data) }) 

  • Tags: Analyst, Database Administrator, IT Trainer

    More questions

    • 1. How would you automatically transfer your visitors to a new web page?
    • Discuss
    • 2. The threshold limit upto which coins can be issued as per the Coinage Act 2011 ?

    • Options
    • A. 100
    • B. 200
    • C. 500
    • D. 1000
    • Discuss
    • 3. Cash Reserve Ratio ( CRR) and Stautory Liquidity Ratio (SLR ) are terms most closely related to which of the following industries/markets :

    • Options
    • A. Mutual Fund
    • B. Income Tax
    • C. Stock Exchange
    • D. Banking
    • Discuss
    • 4. What is the minimum period of time for which one can open an FD(Fixed Deposit) account ?

    • Options
    • A. 15 days
    • B. 6 months
    • C. 7 days
    • D. 1 year
    • Discuss
    • 5. Which Bank has been given scheduled bank status by RBI ?

    • Options
    • A. Disha
    • B. Suryoday
    • C. Janalakshmi
    • D. Ujjivan
    • Discuss
    • 6. Which class is used to indicate Black Navigation Bar ?

    • Options
    • A. .navbar-inverse
    • B. .navbar-black
    • C. .navbar-dark
    • D. .navbar-default
    • Discuss
    • 7. The journal entry to record a credit sale is

    • Options
    • A. Accounts Receivable
    • B. Accounts Payable
    • C. Both A & B
    • D. None of the above
    • Discuss
    • 8. What is CRR rate?
    • Discuss
    • 9. Which among the following are not access Specifiers in C++?

    • Options
    • A. Public
    • B. Protected
    • C. Default
    • D. Private
    • Discuss
    • 10. In which year, the first bank of India "Bank of Hindustan" was established ?

    • Options
    • A. 1677
    • B. 1770
    • C. 1796
    • D. 1831
    • Discuss


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