JavaScript | dataView.getFloat64()

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.
JavaScript code to show the working of this method:
Example 1:

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<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>

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Output:

56.34

Example 2:
Not only float value but also a math function like Math.PI can be taken as the parameter of the function.

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<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>

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Output:



3.1415927410125732

Code #3:
When nothing as data is used to store then it returns NaN i.e, not a number.

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<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>

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Output:

NaN

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