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C D Quiz 16

Quiz by crio

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5 questions
Show answers
  • Q1
    Which keyword is used in JavaScript to declare a variable that cannot be reassigned?
    var
    const
    let
    static
    30s
  • Q2
    What is the main purpose of using closures in JavaScript?
    To retain access to the outer function's scope even after the function has finished executing
    To ensure that a function is only called once
    To define private variables within an object
    To limit the visibility of variables within a specific function
    30s
  • Q3
    In JavaScript, what is the result of 2 == '2'?
    false
    undefined
    null
    true
    30s
  • Q4
    What is the difference between an IIFE (Immediately Invoked Function Expression) and a regular function in JavaScript?
    An IIFE can only take one argument, while a regular function can take multiple arguments.
    An IIFE is a function that is defined and immediately invoked without being stored in a variable, while a regular function is declared and called separately.
    An IIFE is more memory-efficient than a regular function due to its immediate invocation.
    An IIFE cannot access variables in the global scope, while a regular function can.
    30s
  • Q5
    What is the purpose of the 'typeof' operator in JavaScript?
    To perform type conversion
    To declare a new variable
    To determine the data type of a variable or expression
    To define a function
    30s

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