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Javascript,hoisting,closure,let,vat.const

Quiz by RAHUL KUMAR SINGH

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5 questions
Show answers
  • Q1
    Which keyword in JavaScript allows variables to be block scoped?
    block
    const
    dynamic
    let
    var
    30s
  • Q2
    What does the term 'hoisting' refer to in JavaScript?
    Resizing images dynamically
    Animating elements on a webpage
    Variable and function declarations are moved to the top of their containing scope during the compile phase
    Handling user input in real-time
    30s
  • Q3
    What is a closure in JavaScript?
    A type of loop structure
    A way to lock data in a JavaScript application
    An error handling mechanism
    A closure is the combination of a function and the lexical environment within which that function was declared
    30s
  • Q4
    Which keyword in JavaScript is used to declare constants?
    final
    let
    var
    const
    static
    30s
  • Q5
    How does the 'let' keyword differ from the 'var' keyword in JavaScript?
    'let' is declared globally by default
    'var' allows block-scoping in ES6
    'let' is block-scoped while 'var' is function-scoped
    'let' allows variable re-declaration within the same block
    'var' can be used inside for loops only
    30s

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