How to Find the Sum of an Array of Numbers

When working with JavaScript, it is common to come across the need to find the sum of an array of numbers. Whether you are calculating the total price of items in a shopping cart or performing mathematical calculations, finding the sum of an array is a fundamental operation.

In this article, we will explore two different approaches to finding the sum of an array of numbers in JavaScript.

1. Using a For Loop

One way to find the sum of an array of numbers is by using a for loop. This approach involves iterating through each element of the array and adding it to a running total.

Here’s an example code snippet that demonstrates this approach:

const numbers = [1, 2, 3, 4, 5];
let sum = 0;

for (let i = 0; i < numbers.length; i++) {
  sum += numbers[i];
}

console.log(sum); // Output: 15

In this code, we initialize a variable sum to 0. Then, we iterate through each element of the numbers array using a for loop. Inside the loop, we add each element to the sum variable. Finally, we print the sum variable, which gives us the desired result.

2. Using the Reduce Method

Another approach to finding the sum of an array of numbers is by using the reduce method. The reduce method applies a function to each element of the array, resulting in a single output value.

Here's an example code snippet that demonstrates this approach:

const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);

console.log(sum); // Output: 15

In this code, we use the reduce method on the numbers array. The reduce method takes two arguments: a callback function and an initial value for the accumulator. Inside the callback function, we add the accumulator and the currentValue together. The reduce method then applies this function to each element of the array, resulting in the final sum.

Both approaches provide the same result, but the choice between them depends on personal preference and the specific requirements of your code.

Now that you have learned two different approaches to finding the sum of an array of numbers in JavaScript, you can choose the one that best suits your needs. Happy coding!