Best way to find two numbers in an array whose sum is a specific number with JavaScript?

Let’s say the following is our array −

var numbers = [10,3,40,50,20,30,100]

We need to search two numbers from the above array elements, whose sum is 80.

For this, use simple for loop with if condition.

Example

function specificPairsOfSumOfTwoNumbers(numbers, totalValue)
   {
      var storeTwoNumbersObject = {}
      for(var currentNumber of numbers)
      {
         if(storeTwoNumbersObject[currentNumber])
         {
            return {
               firstNumber: totalValue-currentNumber, secondNumber:currentNumber}
            }
            storeTwoNumbersObject[totalValue-currentNumber] = true;
         }
         return false;
   }
   var numbers = [10,3,40,50,20,30,100]
   console.log("The Two numbers which has the sum 80=");
   console.log(specificPairsOfSumOfTwoNumbers(numbers, 80)
)

To run the above program, you need to use the following command −

node fileName.js.

Here my file name is demo207.js.

Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo207.js
The Two numbers which has the sum 80=
{ firstNumber: 50, secondNumber: 30 }