JavaScript DataView.getFloat64() method

The JavaScript DataView.getFloat64() is an inbuilt method in dataView. It is used to get a signed 64-bit float(double) number at a specified location.

NOTE: Range of 64-bit floating point number is from -1.7+308 to +1.7E+308.

Syntax

Parameters

byteoffset: The offset, in a byte, from the start of the view where to read the data.

Return value

A signed 64-bit float number.

Browser Support

Chrome	9
Safari	5.1
Firefox	15
Opera	12.1

Example 1

<script>
//JavaScript to illustrate dataview.getFloat64() method
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(20);
// Creating a view
var arr = new DataView(JavaTpoint);
// put the value 5.7 at slot 1
arr.setFloat64(1,5.7);
document.write("If we give a Float value then output will be<br><br>");
document.write(arr.getFloat64(1));
//expected output:5.7
</script>

Test it Now

Output:

If we give a Float value then output will be
5.7

Example 2

<script>
//JavaScript to illustrate dataview.getFloat64() method
// if there is no data to be stored then it returns Nan
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(10);
// creating a view
var arr = new DataView(JavaTpoint);
// NO Data
arr.setFloat64(1);
document.write(" if there is no data to be stored, then Output will Be:<br><br>")
document.write(arr.getFloat64(1));
//expected output:NAN
</script>

Test it Now

Output:

if there is no data to be stored, then Output will Be:

NaN

Example 3

<script>
//JavaScript to illustrate dataview.getFloat64() method
// creating a ArrayBuffer
var JavaTpoint = new ArrayBuffer(10);
// creating a view
var arr = new DataView(JavaTpoint);
//We can also use math function like Math.PI
document.write("PI value will be<br><br>");
arr.setFloat64(1,Math.PI);
document.write(arr.getFloat64(1));
//expected output: 3.141592653589793
</script>

Test it Now

Output: