What is two sum problem? How to find the two numbers in an array that add up to a given target value in JavaScript? In this video we are looking into Two-Sum Algorithm in JavaScript or Two-Sum problem in javascript. We will write a function to find the two numbers in an array that add up to a given target value in JavaScript. Here is two sum problem solution in javascript.

Here is one way to implement this function. Let's define a function called 'findTwoSum' that takes in an array and a target value as inputs. It will return an array containing the two numbers from the input array that add up to the target value. If no such numbers are found, the function will return an empty array.

Create a new Set object. A set is a collection of unique elements. We will use it to store the numbers that have been encountered in the array so far. Start a for-of loop which will iterate over each element in the array. The current element is assigned to the variable num.

Inside the loop, the function checks if the difference between the target value and the current number (target - num) is already in the set. If it is, then the function has found the two numbers that add up to the target value. Return an array containing those two numbers [num, target - num]. If the complement of the current number is not in the set, the current number is added to the set so that the function can check for its complement on the next iteration.

If the for-of loop finishes and the function has not found any two numbers that add up to the target value, return an empty array. Call the function with the array and the target value. The function will return the numbers in the array that add up to target value.

If I use 8, it gives me 5 and 3. 5 plus 3 is 8.
If I use 13, it gives me 8 and 5. 8 plus 5 is 13.
If I provide it 100, result is an empty array, because no two numbers in array add up to the number 100. So this is how we can find the two numbers in an array that add up to a given target value in JavaScript.

This tutorial looks into following topics:
- How to solve Two-Sum Algorithm in JavaScript
- Explaining Leetcode's Two Sum Problem
- How to Solve Two Sum in JavaScript
- The Two Sum Problem in JavaScript

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It can be a good javascript interview question or frontend interview question. You may not be required to solve it on paper or whiteboard but the interviewer may ask you to give an idea on how to approach this algorithm. If you have an understanding of how to solve this problem or approach this algorithm, you will be able to answer it and get your next job as a frontend developer or full-stack developer.

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