Create Hello World Function
Problem Statement
Problem Description
Write a function createHelloWorld. It should return a new function that always returns "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
Solution of Given Problem
Intuition and Approach
The function createHelloWorld should return a new function that always returns the string "Hello World". The returned function can accept any number of arguments, but it should ignore them and always return "Hello World".
Approaches
The approach involves defining the function createHelloWorld which returns another function that ignores its arguments and returns "Hello World".
Codes in Different Languages
- JavaScript
- TypeScript
- Python
- Java
- C++
/**
* @return {Function}
*/
var createHelloWorld = function() {
return function(...args) {
return "Hello World";
}
};
function createHelloWorld(): (...args: any[]) => string {
return function(...args: any[]) {
return "Hello World";
}
}
def create_hello_world():
def hello_world(*args):
return "Hello World"
return hello_world
import java.util.concurrent.Callable;
public class HelloWorldFactory {
public static Callable<String> createHelloWorld() {
return () -> "Hello World";
}
}
#include <functional>
#include <string>
std::function<std::string()> create_hello_world() {
return []() { return "Hello World"; };
}
Complexity Analysis
-
Time Complexity: O(1), which means it runs in constant time. This is because the function simply returns a new function, without performing any significant computations or iterations.
-
Space Complexity: O(1), which means it uses a constant amount of memory. This is because the function only returns a small, fixed-size function, without allocating any additional memory that scales with the input size.