JavaScript DataView.getFloat64() Method

Below is the example of the DataView.getFloat64() Method.

  • Example: When a positive float number passed as a parameter
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    <script> 
        var buffer = new ArrayBuffer(20); 
        var dataview1 = new DataView(buffer, 0, 10); 
        dataview1.setFloat64(1, 12.01); 
        document.write(dataview1.getFloat64(1) + "<br>"); 
    </script> 

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  • Output:

    12.01
    

    • 



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 a byte and it says from the start of the view were to read the data.


Return value: It returns 64-bit signed float number.




Example 1:


Input: dataview1.setFloat64(1, 56.34); 
Output: 56.34



Example 2:


Input: dataview1.setFloat64(1, Math.PI);
Output: 3.1415927410125732



JavaScript code to show the working of this method:

Code #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


Code #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


Supported Browsers: 


    

  • Google Chrome
    • 

  • Firefox
    • 

  • Apple Safari
    • 

  • Opera
    • 



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