Everything You Need to Know About Nullish Coeslacing Operator in Node.js

Do you know the difference between Nullish Coeslacingand Logical OR Operator

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What is the Nullish Coalescing Operator?

It is a binary operator that returns its right-hand side operand if its left-hand side operand is nullish. (What exactly this means?)

Let’s take a look at the example below.

const text = null ?? 'I Love JS';
console.log(text); // Output: "I Love JS"

In short, it uses the default value that you declare on the right-hand side if the value on the left-hand side is nullish. The term nullish here refer to null and undefined .

How Nullish Coalescing Different from Logical OR Operator?

At this point, you may be wondering what is the difference between nullish coeslacing and Logical OR operator. I have the same question in my mind when I first encountered this. For example:

const text = null || 'I Love JS';
console.log(text); // Output: "I Love JS"

The above code generates the same output as the one using ??.