isItPowerOf2(2).js

function isPowerOf2(n) {
    if (n == 0)
        return false;
    /*
    using bitwise AND operation converts it to binary and compares.
    all powers of 2 (Bitwise AND) powers of 2 - 1 gives 0.
    eg: 16 & 15 = 0
    eg: 10000 & 1111 = 0
    */
    if ((n & (n - 1)) == 0)
        return true;
    return false;
}

function runProgram(input) {
    var newInput = input.split("\n");
    var t = Number(newInput[0]);
    for (var i = 1; i <= t; i++) {
        var n = Number(newInput[i]);
        if (isPowerOf2(n))
            console.log("YES");
        else
            console.log("NO");

    }

}
if (process.env.USERNAME === "Ajit") {
    runProgram(`3
1
2
100`);
} else {
    process.stdin.resume();
    process.stdin.setEncoding("ascii");
    let read = "";
    process.stdin.on("data", function (input) {
        read += input;
    });
    process.stdin.on("end", function () {
        read = read.replace(/\n$/, "");
        read = read.replace(/\n$/, "");
        runProgram(read);
    });
    process.on("SIGINT", function () {
        read = read.replace(/\n$/, "");
        runProgram(read);
        process.exit(0);
    });
}