Target Sum Javascript

twoSum.js

function twoSum(nums, target) {
    // Create a map to store each number and its index
    const numMap = new Map();
    
    // Iterate through the array
    for (let i = 0; i < nums.length; i++) {
        const complement = target - nums[i];
        
        // Check if the complement exists in the map
        if (numMap.has(complement)) {
            // Return the pair (complement, current number)
            return [complement, nums[i]];
        }
        
        // Store the current number and its index in the map
        numMap.set(nums[i], i);
    }
    
    // Return null if no such pair is found
    return null;
}

// Example usage
const nums = [2, 7, 11, 15];
const target = 9;
const result = twoSum(nums, target);
console.log(result);  // Output: [2, 7]