JavaScript DataView.getFloat32() Method

Below is the example of the dataView.getFloat32() Method.

  • Example:
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    <script> 
        var buffer = new ArrayBuffer(20); 
        var dataview1 = new DataView(buffer, 0, 10); 
        dataview1.setFloat32(1, 12.01); 
        document.write(dataview1.getFloat32(1) + "<br>"); 
    </script> 

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  • Output:
    12.010000228881836

The dataView.getFloat32() is an inbuilt function in dataView which is used to get a 32-bit float at the specified location i.e, at byte offset from the start of the dataView. The range of 32-bit floating-point number is form -3.4E+38 to +3.4E+38

Syntax:

dataView.getFloat32(byteOffset)

Parameters: It has parameter byteOffset which is offset in a byte and it says where to read the data from the beginning(start) of the view.

Return value: It returns 32-bit signed float number.



Example 1:

Input: dataview1.setFloat32(1, 56.34);
Output: 56.34000015258789

Example 2:

Input: dataview1.setFloat32(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.setFloat32(1, 56.34);
    document.write(dataview1.getFloat32(1) + "<br>");
  
</script>

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Output:

56.34000015258789

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.setFloat32(1, Math.PI);
    document.write(dataview1.getFloat32(1) + "<br>");
  
</script>

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Output:

3.1415927410125732

Code #3: When there is no data to be stored, 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.setFloat32(1);
    document.write(dataview1.getFloat32(1) + "<br>");
  
</script>

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Output:

NaN

Supported Browsers:

  • Google Chrome
  • Firefox
  • Apple Safari
  • Opera

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