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https://github.com/nyirurugoomar/challenges


https://github.com/nyirurugoomar/challenges

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README 

        
# Challenges



## ArrayMap



The Subarray using javascript function to checks if there exists a contiguous subarray within a given array that sums up to a specified target sum. It uses the sliding window technique for efficient computation.



Parameters

arr (Array of integers): The input array in which to search for a contiguous subarray.

target (Integer): The target sum for the contiguous subarray.

Returns

Boolean: Returns true if a contiguous subarray with the target sum exists, otherwise returns false.

Time Complexity

O(n), where n is the length of the input array.

Space Complexity

O(1), constant space usage.



function Subarray(arr, target) {

    // Initialize the sum of the current subarray to 0.

    let sum = 0;

    // Initialize the starting index of the current subarray to 0.

    let startIndex = 0;



    // Iterate over each element in the array using the endIndex.

    for (let endIndex = 0; endIndex < arr.length; endIndex++) {

        // Add the current element to the sum.

        sum += arr[endIndex];



        // While the sum is greater than the target and the startIndex is less than or equal to the endIndex,

        // adjust the window by subtracting the element at startIndex and incrementing startIndex.

        while (sum > target && startIndex <= endIndex) {

            sum -= arr[startIndex];

            startIndex++;

        }



        // If the current sum equals the target, return true.

        if (sum === target) {

            return true;

        }

    }



    // If no subarray with the target sum is found, return false.

    return false;

}



// Example usage:

let arr = [3, 5, 7, 8, 4, 3];

let target = 30;

console.log(Subarray(arr, target)); // Output: true



* Resources

For more information on related concepts, check out these resources:



Sliding Window Technique - GeeksforGeeks

JavaScript Arrays - W3Schools

JavaScript Array slice() Method - W3Schools

Subarray with given sum - GeeksforGeeks

ChtGpt also help me for more more information



# String Transformation Function



This project contains a JavaScript function that transforms a given string based on specific rules related to its length. The function performs different operations if the length of the string is divisible by 3, 5, or both (15).



## Transformation Rules



1. **If the length of the string is divisible by 3**, reverse the entire string.

2. **If the length of the string is divisible by 5**, replace each character with its ASCII code.

3. **If the length of the string is divisible by both 3 and 5 (i.e., divisible by 15)**, perform both operations in the specified order (reverse the string first, then replace each character with its ASCII code).



## Implementation



The function `transformString` is implemented in JavaScript.



### Function Definition



```javascript

function transformString(s) {

    const length = s.length;

    let result = s;

    

    if (length % 15 === 0) {

        // If length is divisible by 15, perform both operations in order

        result = s.split('').reverse().join(''); // Reverse the string

        result = Array.from(result).map(char => char.charCodeAt(0)).join(''); // Replace with ASCII codes

    } else if (length % 3 === 0) {

        // If length is divisible by 3, reverse the string

        result = s.split('').reverse().join('');

    } else if (length % 5 === 0) {

        // If length is divisible by 5, replace each character with its ASCII code

        result = Array.from(s).map(char => char.charCodeAt(0)).join('');

    }

    

    return result;

}



* Resources

For more information on related concepts, check out these resources:



Sliding Window Technique - GeeksforGeeks

JavaScript Arrays - W3Schools

JavaScript Array slice() Method - W3Schools

Subarray with given sum - GeeksforGeeks

ChtGpt also help me for more more information



  Running the Code

  1.Node.js (Ensure you have Node.js installed on your machine)

  2.Run the code using Node filename