Calculate Sum or Total from Values in Array & Array Object | Learn JavaScript | Reduce Method

How to calculate total sum from values in array using javascript? Consider you are building a shopping cart in JavaScript or ReactJS. User adds few products in cart and goes to cart page. Shopping Cart page should show total price for the items he is ordering. In this tutorial, we will see how can we get total price of items from 'Array' and 'Array Object' by using JavaScript.

I am using a JavaScript file that is linked in an HTML page. Output will be displayed in developer tools console.

We created an 'Array Object' containing service names and their prices. First we declared variable 'total' that has 0 value. From start price is 0. We iterated through Array Object by using forEach method.

There is another way to get total number from Array as well. That is 'Array Reduce' method.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

We can use javascript reduce method to calculate sum of numbers from Array. This is fine, but in our example we have 'Array Object'. We can also calculate sum of values / numbers in an 'Array Object'.

Total is accumulator in our example and 0 is its initial value. Each value from Array will be added in accumulator to give us total number. This is how you can calculate sum of all values from 'Array' or 'Array Object' easily.

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