how to convert from decimal to binary in javascript code example

Example 1: javascript convert number to binary

function dec2bin(dec){
    return (dec >>> 0).toString(2);
}

dec2bin(1);    // 1
dec2bin(-1);   // 11111111111111111111111111111111
dec2bin(256);  // 100000000
dec2bin(-256); // 11111111111111111111111100000000

Example 2: string to binary javascript

// string to binary
parseInt(num.toString(2));

// binary to string
parseInt(num.toString(2), 2);