createHelloWorld. It should return a new function that always returns "Hello World".
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 <= 10The key idea behind #2667 Create Hello World Function is understanding higher-order functions and how functions can return other functions. The task is to implement a function that returns another function which, when executed, always returns the string "Hello World".
The outer function acts as a factory that creates a new function. The returned function ignores any parameters passed to it and simply returns the constant string. This demonstrates a basic concept of closures and function composition, where a function can encapsulate behavior and return it for later execution.
Since the returned function performs a constant operation—returning a fixed string—no iteration or additional data structures are required. The implementation is straightforward and focuses mainly on correctly returning a function rather than executing it immediately.
Because the operation is constant, both time complexity and space complexity remain minimal.
This approach uses the concept of closures to return a function that ignores its arguments and always returns the string 'Hello World'. In this method, createHelloWorld returns a new function that consistently returns the string when invoked.
In C, we use a function createHelloWorld that simply returns the string "Hello World". We then define a function pointer type hello_function to point to such functions and return it through another function getHelloWorldFunction.
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Time Complexity: O(1) as the function performs a constant-time operation.
Space Complexity: O(1) since it doesn't use any extra space dependent on input size.
This approach directly returns a function without using intermediate variables like closures. The returned function will always output 'Hello World', ignoring any provided arguments.
In C, we create a simple function returnHelloWorld that directly returns the string "Hello World". This can be used in place of closures as C lacks native closure support.
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Time Complexity: O(1). The function executes a single return instruction.
Space Complexity: O(1) as there are no dynamic allocations.
| Approach | Complexity |
|---|---|
| Closure Approach | Time Complexity: O(1) as the function performs a constant-time operation. |
| Direct Return Approach | Time Complexity: O(1). The function executes a single return instruction. |
| Approach | Time Complexity | Space Complexity |
|---|---|---|
| Return a constant function (Higher-Order Function) | O(1) | O(1) |
Create Hello World Function (Closure - Day1) - Leetcode 2667 - JavaScript 30-Day Challenge • NeetCodeIO • 110,559 views views
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