Convert java function with long variable to NodeJS

In Java function have "long" variable.

public class LongToIntExample1{  
	public static void main(String args[]){  
		long l=2672558412L;  
		int i=(int)l;  
		System.out.println(i);  
	}
}

> => Output: -1622408884

I tried with NodeJS function as below but wrong output:

module.exports.LongToIntExample1 = () => {
	var l = 2672558412n;
	var i = parseInt(l);
	console.log(i);
}

> => Output: 2672558412

How to write NodeJS function as Java function with same output?

If you read this answer: https://stackoverflow.com/a/4355475/1725871 Java will wrap the part of the long that is over Integer.MAX_VALUE around and the value will become negative.

Clearly that is not the case in NodeJS

Since a long is bigger than an int, the behaviour you are trying to reproduce is actually a biproduct of the Java implementation not being safe, ie not checking if the long value is less than Integer.MAX_VALUE

Personally I would not rely on a mechanic like that in my programs

We can cast the number to a 32-bit signed int, using the built-in Int32Array like so:

<!-- begin snippet: js hide: false console: true babel: null -->
<!-- language: lang-js -->

function LongToIntExample1(num) {
     return (new Int32Array([num]))[0];
}
 
console.log(LongToIntExample1(2672558412))
console.log(LongToIntExample1(2147483647))

<!-- end snippet -->