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JavaScript DataView.getFloat64() Method

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  • Last Updated : 10 Oct, 2021
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Below is the example of the DataView.getFloat64() Method. 
 

  • Example: When a positive float number passed as a parameter 
     

javascript




<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>

  • 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: 
 

javascript




<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>

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. 
 

javascript




<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>

Output: 
 

3.1415927410125732

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

javascript




<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>

Output: 
 

NaN

Supported Browsers: 
 

  • Google Chrome 9 and above
  • Edge 12 and above
  • Firefox  15 and above
  • Internet Explorer 10 and above
  • Opera 12.1 and above
  • Safari 5.1 and above

 


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