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  • What is the purpose of the map() function in JavaScript?

    • The map() function is used to iterate over an array and apply a transformation or computation on each element, returning a new array with the transformed elements​ (Built In)​.

  • What is the difference between splice() and slice()?

    • splice() modifies an array by adding, removing, or replacing elements, while slice() creates a new array containing a portion of the original array without modifying it​ (Built In)​.

  • How do you remove duplicates from an array in JavaScript?

    • You can use the Set object or the filter() method along with indexOf() to remove duplicates from an array​ (Built In)​.

  • What are closures in JavaScript?

    • Closures are functions that have access to variables from another function’s scope. This happens due to the function being defined within the other function, allowing access to its local variables​ (Built In)​.

  • Explain the difference between == and ===.

    • == checks for equality of value, performing type conversion if necessary, while === checks for both value and type without performing any type conversion​ (Guru99)​.

  • How can you check if an array includes a certain value in JavaScript?

    • The includes() method can be used to check if an array contains a specific value, returning true if it does and false otherwise​ (Built In)​.

  • What is the difference between var, let, and const?

    • var has function scope and can be re-declared and updated. let has block scope and can be updated but not re-declared. const also has block scope but cannot be updated or re-declared​ (zety)​.

  • How do you handle asynchronous code in JavaScript?

    • Asynchronous code in JavaScript can be handled using callbacks, Promises, and async/await syntax​ (Guru99)​.

  • What is the purpose of the reduce() function in JavaScript?

    • The reduce() function reduces an array to a single value by applying a function to each element and accumulating the result​ (Built In)​.

  • What is the fetch() function used for in JavaScript?

    • The fetch() function is used to make asynchronous HTTP requests, returning a Promise that resolves to the response from the server​ (Built In)​.
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