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var buffer = [ ];

for (var i = 1; i < 101; i++) {
    if (i % 3 == 0) {
        buffer.push('fizz');
    }

    if (i % 5 == 0) {
        buffer.push('buzz');
    }

    if (buffer.length == 0) {
        console.log(i);
    }
    else {
        console.log(buffer.join(''));
        // Fancy way of emptying the array.
        buffer.length = 0;
    }
}