LeetCode Problem Workspace
Create Hello World Function
The Create Hello World Function problem tests a candidate's ability to return a constant value from a function regardless of input.
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Easy · Create Hello World Function core interview pattern
Answer-first summary
The Create Hello World Function problem tests a candidate's ability to return a constant value from a function regardless of input.
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To solve this problem, create a function that returns 'Hello World' no matter the input. This problem is designed to test your ability to ignore parameters and always return a fixed string. The solution involves simple function creation with no impact from the function arguments.
Problem Statement
In this problem, you need to implement a function, createHelloWorld, which returns another function. The returned function, when invoked, should always return the string 'Hello World', regardless of any arguments passed to it.
Your task is to focus on defining the function creation pattern that can disregard input arguments and always return the fixed string 'Hello World'. The input can vary, and the output should remain constant.
Examples
Example 1
Input: args = []
Output: "Hello World"
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"
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
Solution Approach
Function Creation
Define a function createHelloWorld that returns another function. The returned function should ignore all arguments and simply return 'Hello World'.
Argument Handling
Make sure that the function created by createHelloWorld can handle any arguments, even if they are passed. The key is to disregard them completely while always returning 'Hello World'.
Test Edge Cases
Test the solution with different inputs (e.g., empty arrays, null values, etc.) to verify that the output is consistently 'Hello World' regardless of the arguments passed.
Complexity Analysis
| Metric | Value |
|---|---|
| Time | Depends on the final approach |
| Space | Depends on the final approach |
Since the solution involves returning a fixed string, the time and space complexity are both constant, O(1), regardless of the input size or type.
What Interviewers Usually Probe
- Look for the candidate's understanding of function creation and returning another function.
- Check if they grasp how to ignore parameters and return a fixed value.
- Assess if they handle edge cases where arguments might be passed to the returned function.
Common Pitfalls or Variants
Common pitfalls
- Overcomplicating the function logic or introducing unnecessary complexity.
- Not returning the correct string or forgetting to return 'Hello World'.
- Misunderstanding the problem and adding functionality that affects the returned value.
Follow-up variants
- Create a function that returns 'Hello Universe' instead of 'Hello World'.
- Modify the function to return a different string based on some internal logic while still ignoring parameters.
- Extend the function to handle and ignore different types of arguments (e.g., strings, objects, numbers).
FAQ
How do I solve the Create Hello World Function problem?
To solve the Create Hello World Function problem, you need to create a function that always returns 'Hello World', regardless of the arguments passed to it.
What is the time complexity for the Create Hello World Function problem?
The time complexity is O(1) because the function always returns the same value and does not depend on input size or type.
What should I focus on when solving the Create Hello World Function problem?
Focus on returning a fixed value ('Hello World') from a function, regardless of the arguments. The pattern is about ignoring input and always producing the same output.
How do I handle arguments passed to the function?
You should ignore any arguments passed to the function and always return 'Hello World'. The input does not affect the output.
What are common mistakes when solving the Create Hello World Function problem?
Common mistakes include overcomplicating the solution, not returning the correct value, or accidentally incorporating logic that affects the returned value.
Solution
Solution 1
#### TypeScript
function createHelloWorld() {
return function (...args): string {
return 'Hello World';
};
}
/**
* const f = createHelloWorld();
* f(); // "Hello World"
*/