JS Logical AND
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var n1 = '000100';
var n2 = '100101';
var result = (parseInt(n1) & parseInt(n2)).toString(2);
var leadingZeros = Array(Math.max(n1.length, n2.length) - result.length + 1).join('0');
console.log(leadingZeros + result.toString(2));
JavaScript
INFO