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Create Hello World Function

Updated on 21 May, 2025
Create Hello World Function header image

Problem Statement

The task is to create a function named createHelloWorld. When this function is invoked, it should return another function. The returned function should be designed such that no matter how it is called or what arguments are passed to it (up to 10 arguments are allowed), it will always return the string "Hello World".

Examples

Example 1

Input:

args = []

Output:

"Hello World"

Explanation:

const f = createHelloWorld();
f(); // "Hello World"
The function returned by createHelloWorld should always return "Hello World".

Example 2

Input:

args = [{},null,42]

Output:

"Hello World"

Explanation:

const f = createHelloWorld();
f({}, null, 42); // "Hello World"
Any arguments could be passed to the function but it should still always return "Hello World".

Constraints

  • 0 <= args.length <= 10

Approach and Intuition

Step-by-step Breakdown

  1. Understand the Function Behavior:

    • createHelloWorld function needs to generate and return another function. This inner function is the critical piece, as it requires a specific behavior: always returning the string "Hello World".

  2. Creating the Inner Function:

    • This inner function, while accepting multiple arguments, should not actually utilize these arguments to perform any operations. Its sole job is to constantly output the string "Hello World".

  3. Returning a Function:

    • Make sure that what createHelloWorld returns is indeed a function. This is paramount as it directly influences the behavior of any invoked instances of this function.

  4. **Handling Arguments:

    • Even though arguments can be passed and the constraints specify the function should handle up to 10 arguments, these are essentially ignored within the inner function. This design demonstrates an example of a function that shields its return output from input variability - a principal known as input non-dependence in this context.

Examples Clarification

  • Example 1:

    • Calling the function obtained from createHelloWorld without any arguments. Consistent with the design, it ignores the absence of arguments and outputs "Hello World".

  • Example 2:

    • This demonstrates the function's robustness by being called with various arguments (an empty object, null, and the number 42 in this case). Regardless of the argument types or values, the result remains unchanged, supporting the concept of complete input irrelevance in terms of affecting the output for this particular implementation.

Solutions

  • JavaScript
js 
var generateHelloWorld = function() {
    return (...parameters) => "Hello World";
};

The task involves creating a function titled generateHelloWorld in JavaScript that, when called, returns another function. This returned function, when invoked with any number of parameters, consistently outputs the string "Hello World".

Here is the solution breakdown:

  • Define a variable generateHelloWorld which holds an assigned function.
  • This function, when executed, returns another function.
  • The inner function, defined as an arrow function, accepts any number of parameters (indicated by ...parameters) but ignores these parameters in its implementation.
  • The sole task of the inner function is to return the string "Hello World".

Execute generateHelloWorld to get the function that delivers the greeting, exemplified by:

javascript 
var helloFunction = generateHelloWorld();
console.log(helloFunction()); // Outputs: "Hello World"

This approach ensures that whenever the resulting function from generateHelloWorld is invoked, regardless of the context or arguments provided, it will always return "Hello World".

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