ReferenceError: Cannot access 'myFunction' before initialization

Created at 29-Sep-2021, By samar

Error ReferenceError: Cannot access 'myFunction' before initialization occurs in javascript when you call function before initializing it. You have to create function above in the page before the function call.

  • Solution for error ReferenceError: Cannot access 'myFunction' before initialization in javascript

    // Solution

    <script>
    const myFunction = (val) => { return 'You have pass input to function = '+ val  }
    const output = myFunction(20);
    console.log(output);
    </script>
    

    //Code snippet which produce error - ReferenceError: Cannot access 'myFunction' before initialization

    <script>
    const output = myFunction(20);
    console.log(output);
    const myFunction = (val) => { return 'You have pass input to function = '+ val  }
    </script>
    

    You have to define function (above) first before calling it using const in javascript to avoid error ReferenceError: Cannot access 'myFunction' before initialization.

  • How to fix "Uncaught ReferenceError: Cannot access x before initialization"

    The "Cannot access before initialization" error occurs when a variable declared using let or const is accessed before it was initialized in the scope. To solve the error, make sure to initialize the variable before accessing it.

  • How to initialize variable in javascript to avoid errors?

    Use Linter Setting that Automatically Initializes All Variables. We can use a linter to check that all variables are initialized. This makes the process automatic so that we can avoid errors.

  • Why it is important to initialize the variable in Javascript?

    Initialization is the assignment of initial value to a variable. Initialization must be done before the variable is used. Otherwise, the variable will hold a value of "undefined" or "null", which is not desired.

  • What happens if you don't initialize a variable?

    An uninitialized variable is a variable that has not been given a value by the program (generally through initialization or assignment). Using the value stored in an uninitialized variable will result in undefined behavior.

  • What are the 4 ways to declare a JavaScript variable?

    4 Ways to Declare a JavaScript Variable:

    • Using var.
    • Using let.
    • Using const.
    • Using nothing.
  • Why do we use initialization?

    Initialization is the process of assigning a value to the Variable. Every programming language has its own method of initializing the variable. If the value is not assigned to the Variable, then the process is only called a Declaration.

  • What is lexical declaration?

    Lexical declarations introduce new declaration forms for defining variables using the let and const keywords. let is similar to var , but defines a variable limited in scope to the block, statement or expression in which it is used.

  • Can I declare a variable without initializing JavaScript?

    We can use the let keyword. We use the let keyword when variables are mutable. That means we can change or set the value later on in the program. When the value of the variable will never change, when it stays constant, we use the keyword const.

  • Can you declare a variable without initializing it?

    If you declare a final variable later on you cannot modify or, assign values to it. Moreover, like instance variables, final variables will not be initialized with default values. Therefore, it is mandatory to initialize final variables once you declare them.

  • Can you call a function before declaring it?

    For example: function myFunction() { // do something }; As you can see, the function name ( myFunction ) is declared when the function is created. This means that you can call the function before it is defined.

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