Is there “0b” or something similar to represent a binary number in Javascript

Question

I know that 0x is a prefix for hexadecimal numbers in Javascript. For example, 0xFF stands for the number 255.

Is there something similar f

Answer 1

In ECMASCript 6 this will be supported as a part of the language, i.e. 0b1111 === 15 is true. You can also use an uppercase B (e.g. 0B1111).

Look for NumericLiterals in the ES6 Spec.

Answer 2

Convert binary strings to numbers and visa-versa.

var b = function(n) {
    if(typeof n === 'string')
        return parseInt(n, 2);
    else if (typeof n === 'number')
        return n.toString(2);
    throw "unknown input";
};

Answer 3

// Conversion function
function bin(nb)
{
    return parseInt(nb.toString(2));
}

// Test
var stop = false;
while(!stop)
{
    var n = parseInt(prompt("Type a decimal number : "));
    alert(bin(n));

    var str = prompt("Retry ? Y / N");
    if(str === "N") { stop = true; }
}

Answer 4

May be this will usefull:

var bin = 1111;
var dec = parseInt(bin, 2);
// 15

Answer 5

No, but you can use parseInt and optionally omit the quotes.

parseInt(110, 2); // this is 6 
parseInt("110", 2); // this is also 6

The only disadvantage of omitting the quotes is that, for very large numbers, you will overflow faster:

parseInt(10000000000000000000000, 2); // this gives 1
parseInt("10000000000000000000000", 2); // this gives 4194304

Answer 6

If your primary concern is display rather than coding, there's a built-in conversion system you can use:

var num = 255;
document.writeln(num.toString(16)); // Outputs: "ff"
document.writeln(num.toString(8)); // Outputs: "377"
document.writeln(num.toString(2)); // Outputs: "11111111"

Ref: JavaScript Number Reference