JavaScript DataView getFloat32() Method

Quiz

The JavaScript DataView getFloat32() method is used to retrieve 4-byte floating point numbers starting at the specified byte offset of this data view and decodes them into 32-bit floating point numbers. You can fetch multiple byte values from any offset within bounds.

This method throws a 'RangeError' exception if the value of the byte offset parameter falls outside the bounds of this data view.

Syntax

Following is the syntax of the JavaScript DataView getFloat32() method −

getFloat32(byteOffset, littleEndian)

Parameters

This method accepts two parameters named 'byteOffset' and 'littleEndian', which are described below −

byteOffset − The position in the DataView from which to read the data.
littleEndian (optional) − It indicates whether the data is stored in little-or-big endian.

Return value

This method returns an integer within the range of -3.4e38 to 3.4e38.

Example 1

The following is the basic example of the JavaScript DataView getFloat32() method.

<html>
<body>
<script>
   const buffer = new ArrayBuffer(16);
   const data_view = new DataView(buffer);
   const byteOffset = 0;
   const value = Math.PI;
   document.write("The byte offset: ", byteOffset);
   document.write("<br>Value: ", value);
   //storing the value
   data_view.setFloat32(byteOffset, value);
   document.write("<br>The stored value: ", data_view.getFloat32(byteOffset));
</script>
</body>
</html>

Output

The above program returns the stored value as "3.1415927410125732".

The byte offset: 0
Value: 3.141592653589793
The stored value: 3.1415927410125732

Example 2

If the byteOffset parameter value falls outside the bounds of this data view, it will throw a 'RangeError' exception.

<html>
<body>
<script>
   const buffer = new ArrayBuffer(16);
   const data_view = new DataView(buffer);
   const byteOffset = 1;
   const value = 3.445323412;
   document.write("The byte offset: ", byteOffset);
   document.write("<br>Value: ", value);
   //storing the value
   data_view.setFloat32(byteOffset, value);
   try {
      document.write("<br>The stored value: ", data_view.getFloat32(-1));
   } catch (error) {
      document.write("<br>", error);
   }
</script>
</body>
</html>

Output

After executing the above program, it will throw an exception as −

The byte offset: 1
Value: 3.445323412
RangeError: Offset is outside the bounds of the DataView

Print Page