JavaScript – how to make an automated calculation system

This article shows “how to make a simple automated calculation system” with JavaScript.
Basically this is for me to learn, but I hope this is for beginners of JavaScript.

Development Environment
Browser: Google Chrome
System: WordPress

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Example

There are a lot of ways to write the code, but I introduce just the 3 ways as below.
I believe these are easier ways to understand from my experience.

The Simplest Code

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If you input some numbers in the left side boxes, you can get the total of the numbers automatically.
* This appearance and the system is the same as the following other examples.

Code

Using “function()” to integrate the calculation parts

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=

If you input some numbers in the left side boxes, you can get the total of the numbers automatically.
* This appearance and the system is the same as the other examples.

Code

The HTML and the CSS are the same as the other examples.

Using “forEach” to integrate the same code

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=

If you input some numbers in the left side boxes, you can get the total of the numbers automatically.
* This appearance and the system is the same as the other examples.

Code

The HTML and the CSS are the same as the other examples.

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