The dataView.getFloat64() is an inbuilt function in dataView which is used to get a 64-bit float at the specified location i.e, at byte offset from the start of the dataView. The range of 64-bit floating point number is form -1.7E+308 to +1.7E+308
Parameters: It has parameter byteOffset which is offset in byte and it says from the start of the view where to read the data.
Return value: It returns 64-bit signed float number.
Not only float value but also a math function like Math.PI can be taken as the parameter of the function.
When nothing as data is used to store then it returns NaN i.e, not a number.
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