Comment convertir un entier en binaire en JavaScript ?

Question

J'aimerais voir les nombres entiers, positifs ou négatifs, en binaire.

Plutôt comme cette question mais pour JavaScript.

Answer 1

Voici mon code :

var x = prompt("enter number", "7");
var i = 0;
var binaryvar = " ";

function add(n) {
    if (n == 0) {
        binaryvar = "0" + binaryvar; 
    }
    else {
        binaryvar = "1" + binaryvar;
    }
}

function binary() {
    while (i < 1) {
        if (x == 1) {
            add(1);
            document.write(binaryvar);
            break;
        }
        else {
            if (x % 2 == 0) {
                x = x / 2;
                add(0);
            }
            else {
                x = (x - 1) / 2;
                add(1);
            }
        }
    }
}

binary();

Answer 2

Voici la solution . C'est très simple en fait

function binaries(num1){ 
        var str = num1.toString(2)
        return(console.log('The binary form of ' + num1 + ' is: ' + str))
     }
     binaries(3

)

        /*
         According to MDN, Number.prototype.toString() overrides 
         Object.prototype.toString() with the useful distinction that you can 
         pass in a single integer argument. This argument is an optional radix, 
         numbers 2 to 36 allowed.So in the example above, we’re passing in 2 to 
         get a string representation of the binary for the base 10 number 100, 
         i.e. 1100100.
        */