Interview Question 6 | Javascript Pro | @codeDynasty-O95 #javascript #coding

The code defines an array `arr` containing a list of numbers. It also defines a function `evenSum` that takes an array as an argument. This function calculates the sum of all the even numbers in the given array.

Here's a step-by-step explanation of how the code works:

1. The array `arr` is defined with the values [1, 2, 3, 4, 5, 6, 7, 8, 9, 7].

2. The `evenSum` function is defined with the parameter `arr`.

3. Inside the `evenSum` function, a variable `sum` is initialized to 0. This variable will be used to store the sum of even numbers.

4. The `forEach` method is called on the `arr` array. This method iterates over each element of the array and executes the provided callback function for each element.

5. The callback function takes a parameter `num`, which represents the current element being iterated.

6. Inside the callback function, there is an `if` statement that checks if `num` is divisible by 2 (i.e., if it is an even number). The `%` operator calculates the remainder when `num` is divided by 2, and if the remainder is 0, then `num` is even.

7. If the condition in the `if` statement is true, the code inside the `if` block is executed. In this case, the current `num` is added to the `sum` variable using the `+=` operator. This accumulates the sum of all even numbers encountered so far.

8. After all elements of the `arr` array have been iterated, the `forEach` method finishes, and the final value of `sum` is returned from the `evenSum` function.