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
Syntax:
dataView.getFloat64(byteOffset)
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.
Code #1:
<script> // Creating buffer with size in byte var buffer = new ArrayBuffer(20); // Creating a view var dataview1 = new DataView(buffer, 0, 10); // put the data 56.34 at slot 1 dataview1.setFloat64(1, 56.34); document.write(dataview1.getFloat64(1) + "<br>"); </script> |
Output:
56.34
Code #2:
Not only float value but also a math function like Math.PI can be taken as the parameter of the function.
<script> // Creating buffer with size in byte var buffer = new ArrayBuffer(20); // Creating a view with slot from o to 10 var dataview1 = new DataView(buffer, 0, 10); // put the value of PI at slot 1 dataview1.setFloat64(1, Math.PI); document.write(dataview1.getFloat64(1) + "<br>"); </script> |
Output:
3.1415927410125732
Code #3:
When nothing as data is used to store then it returns NaN i.e, not a number.
<script> // Creating buffer with size in byte var buffer = new ArrayBuffer(20); // Creating a view var dataview1 = new DataView(buffer, 0, 10); // putting no data at slot 1 dataview1.setFloat64(1); document.write(dataview1.getFloat64(1) + "<br>"); </script> |
Output:
NaN
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