The Nullish coalescing operator(??) is a logical operator that returns the right side operand when its left side operand is null or undefined, otherwise it returns left side operand.
For Example:- 
<pre><code>const foo = null ?? "it is foo"; // output it is foo

const baz = 0 ?? 44 // output 44
</code></pre>The Logical operator (| |) is differs from Nullish coalescing operator(??) 
Logical operator (| |) is returns the right side operands if left side operands is falsy (" " /' '/``, 0, -0, 0n, false, null, undefined,) ,not only null or undefined,otherwise returns left side operands.
For Example:- 
<pre><code>const checkNumber= 2 || "it is foo"; // output 2

const checkString= "" || "100" // output 100

const message = 0 || hello // output hello
</code></pre>

The **Nullish coalescing operator(??)** is a logical operator that returns the right side operand when its left side operand is **null or undefined**, otherwise it returns left side operand.

For Example:- 
```
const foo =  null ?? "it is foo";  // output   it is foo

const baz = 0 ??  44  // output 44

``` 

The **Logical operator (| |)** is differs from Nullish coalescing operator(??) 

**Logical operator (| |)** is returns the right side operands if left side operands is falsy (" " /' '/``, 0, -0, 0n, false, null, undefined,) ,not only **null or undefined**,otherwise returns left side operands.


For Example:- 
```
const checkNumber=  2 ||  "it is foo";  // output   2

const checkString= "" || "100" // output 100

const message = 0 ||  hello  // output hello

``` 







Nullish coalescing operator (??)