In this article, you are going to learn the difference between arrow functions vs traditional (regular) functions in JavaScript through a few examples – we are going to browse through differences and similarities and learn when to use each.
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In JavaScript, null and undefined may look the same, but they are not. In this article, you will learn the differences and similarities between null and undefined in JavaScript, and when you should use each.
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In this article, you are going to learn more about JavaScript functions and methods. In short – a function can live on its own, it does not need an object, but a method is a function connected with an object property, but let’s take a look and see what are the similarities and differences between functions vs. methods in JavaScript.
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In this article, you’re going to learn the difference between JSON and JavaScript object.
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Should I use single (‘) or double (“) quotes when working in JavaScript? That’s the question now.

'abc' === "abc" // true

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In this article, you’re going to learn when to use const in JavaScript, what is a constant (const), and how it’s different from an “ordinary” variable (let).
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Semicolons are optional in JavaScript, but sometimes they’re not. Wait, what? Are they optional or not?
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In this article, we are going to present how to clone an object in Javascript. There are actually at least four ways to copy an object and they differ from each other in a few ways. You can use:

• the spread syntax,
• the object rest syntax,
• object.assign() method,
• and the JSON.stringify() and JSON.parse() methods.

So, take a look at each and see when it’s best to use a specific method.
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In this article, we are going to investigate what are the differences (and similarities) between JavaScript arrays and objects, and how do you know when to use objects vs arrays?
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Maybe you have an issue with a server, which is sometimes returning either a JSON string with some useful data, and at other times server returns an error message string, which is produced by the PHP function mysql_error(). A simple solution to this problem would be to test whether this data is a JSON string or an error message.

A straightforward answer to a question on how to test if a string is JSON or not would be to use JSON.parse function isJson(str), like so:

function isJson(str) {
    try {
        JSON.parse(str);
    } catch (e) {
        return false;
    }
    return true;
}

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