Parse binary string as byte in JavaScript

Question

I have a binary string like "11100011" and I want to convert it into a byte. I have a working example in Java like below:

byte b1 = (byte)Integer.parseInt("11100011", 2);
System.out.println(b1);

Here the output will be -29. But if I write some similar code in JavaScript like below:

parseInt('11100011', 2);

I get an output of 227.

What JavaScript code I should write to get the same output as Java?

Sizik · Accepted Answer · 2014-10-17 18:01:41Z

6

Java is interpreting the byte as being a signed two's-complement number, which is negative since the highest bit is 1. Javascript is interpreting it as unsigned, so it's always positive.

Try this:

var b1 = parseInt('11100011', 2);
if(b1 > 127) b1 -= 256;

answered Oct 17, 2014 at 18:01

Sizik

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