What is the use of the underscore variable in REPL?

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In REPL, the underscore variable is used to get the last result.

In Node.js REPL (Read-Eval-Print Loop), the underscore variable (_) serves as a reference to the result of the last operation. It allows users to conveniently access the result of the previous expression or operation without explicitly storing it in a variable.

For example:

javascript
> 10 + 5
15
> _ * 2
30
> Math.pow(_, 2)
900

Here, _ refers to the result of the last operation, so _ * 2 refers to 15 * 2, and Math.pow(_, 2) refers to 900, which is 30 squared.

So, in summary, the underscore variable in Node.js REPL is used to reference the result of the last operation, making it convenient for subsequent calculations or operations.