var BinaryView = function(buffer) {
    this.buffer = buffer;
    this.view = new DataView(this.buffer);
};

BinaryView.prototype.flip = function(bitIndex) {
    if (bitIndex > this.buffer.byteLength * 8) {
        console.error("invalid bit location", bitIndex);
        return;
    }

    var byteIndex = bitIndex >> 3;
    var bit  = bitIndex - (byteIndex << 8);
    var mask = 1 << bit;

    var currentValue = this.view.getUint8(byteIndex);
    var newValue = currentValue ^ mask;

    this.view.setUint8(byteIndex, newValue);
};

var t = new BinaryView(new ArrayBuffer(5));