Constructor function show array literals [] instead of {}

[phil151again]

Version

18.7.0

Platform

Linux nyufo-Aspire-A315-34 5.19.0-38-generic #39-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 17 17:33:16 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

const stringExample = new String('Hello World')

console.log(stringExample)
console.log(typeof stringExample)

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior? Why is that the expected behavior?

No response

What do you see instead?

in the latest Firefox show curly brackets, but in node in console show array literals

Additional information

No response

[phil151again]

//another issue:
const testNumber = new Number(12)
console.log(testNumber.valueOf)

/* in Firefox reurns 12, in Node return [Function: valueOf]
*/

[VoltrexKeyva]

I can't reproduce the original issue, I'm not even sure what you're referring to because the output is:

[String: 'Hello World']
object

If you're referring to the [] around the first output, there's no issue here as the output of anything being logged is implementation-defined. Node.js follows the console specification by WHATWG, the console.log() method uses a printer, and the said printer's output is implementation-defined as described here:

The logger operation accepts a log level and a list of other arguments. Its main output is the implementation-defined side effect of printing the result to the console. This specification describes how it processes format specifiers while doing so.

[VoltrexKeyva]

//another issue:
const testNumber = new Number(12)
console.log(testNumber.valueOf)

/* in Firefox reurns 12, in Node return [Function: valueOf]
*/

Node.js is correct here as %Number.prototype.valueOf()% is a method and not a getter as described in the JavaScript specification here.

[aduh95]

//another issue: const testNumber = new Number(12) console.log(testNumber.valueOf)

/* in Firefox reurns 12, in Node return [Function: valueOf] */

In Firefox, I get function valueof, not 12.

in the latest Firefox show curly brackets, but in node in console show array literals

Here's the output I get on Firefox:

String { "Hello World" }
object

As @VoltrexKeyva said, the output of console.log is implementation-defined, it's expected to see discrepancies. Node.js doesn't show an array literal, it uses square brackets.

I'm going to close the issue because I believe there's nothing to be done on Node.js side, but don't hesitate to ask more questions.