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JavaScript Sum Array Of Objects

Last Updated : Jul 1, 2023

JavaScript Sum Array Of Objects

In this tutorial we will show you the solution of JavaScript sum array of objects, here we are going to show you example for sum defined object’s specific value of property using forEach loop.

As we know usually all types of loops helps for iteration process so here for iterate defined associate array we used forEach loop then we done sum operation with specific property then at last we printed sum result on console.

Step By Step Guide On JavaScript Sum Array Of Objects :-

Here we defined associative array variable ‘arr’ with three sets of key, value pairs and we defined another variable ‘sum’ with initialized value ‘0’ for refresh purpose.

Then we appending ‘arr’ with forEach loop there for iterating purpose we declared variable ‘i’ and using i with object ‘amt’ in array ‘arr’ it refers each values in arr ‘amt’.

Now we adding each values to the sum and lastly we printed sum value at console panel.

<!DOCTYPE html>
<html>
    <head>
        <title>SUM ARRAY OF OBJECTS</title>
    </head>
    <body>
        <script>
            const arr = [
                {id: 1, amt: 100},
                {id: 2, amt: 150},
                {id: 3, amt: 50},
            ];
            let sum=0;
            arr.forEach(i=>{
                sum+=i.amt;
            });
            console.log(sum);
        </script>
    </body>
</html>
  1. <!DOCTYPE html> tag which is instruct the web browser about what version of HTML file written in and it’s not have any ending tag.
  2. The<html> tag is used to indicate the beginning of HTML document.
  3. As above shown <head> tag is contain information about webpage and external file links are declared here. <title> tag is used for set the webpage title.
  4. Both <head> and <title> tags having their pair end tag, so we need to close the ending tags respectively. If you’re not closed anyone of ending tag properly that is also affect the webpage result.
  5. <body> tag is beginning of main coding part because it contain coding of entire website blocks and elements described here.
  6. In script we defined variable associative array ‘arr’ with three sets of key, value pairs ‘{id: 1, amt: 100}, {id: 2, amt: 150}, {id: 3, amt: 50},’ and defined another variable ‘sum’ for stores added each value.
  7. For access array ‘arr’s’ object property ‘amt’ we needs to append that with forEach loop there we declared variable ‘i’ for doing iteration purpose.
  8. Within loop we specified each value of ‘amt’ in array arr then we added each time with variable ‘sum’ with the help of iteration variable ‘i’ and last we printed finial sum on console.
  9. Both </body>,</html> tags closed respectively. </body> tag indicates the end of body, Then </html> tag indicates the end of HTML document.

Conclusion :-

In conclusion now we are able to know how to do sum with array objects in javascript.

When we executes program on browser we can’t see the result because we printed on console panel so we have to use shortcut ‘ctrl+shift+j’ then console panel will open at right hand side with result ‘300’.

If your need to do define array with some other values or properties then you can modify it using this concept.

I hope this tutorial on JavaScript sum array of objects helps you and the steps and method mentioned above are easy to follow and implement.