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JavaScript dataView.setFloat64() Method

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  • Difficulty Level : Easy
  • Last Updated : 10 Oct, 2021

Below is the example of the dataView.setFloat64() Method. 
 

  • Example: 
     

javascript




<script>
var buffer = new ArrayBuffer(20);
 
var dataview1 = new DataView(buffer, 0, 10);
 
dataview1.setFloat64(1, 12.22);
document.write(dataview1.getFloat64(1));
</script>

  • Output: 
     
12.22

The dataView.setFloat64() is an inbuilt function in dataView which is used to store a signed 64-bit float value at the specified location i.e, at byte offset from the start of the dataView. 
Syntax: 
 

dataView.setFloat64(byteOffset)

Parameters: It has parameter byteOffset which is offset in byte i.e. from the start of the view were to read the data.
Return value: This function does not return anything.
Example 1: 
 

Input: dataview1.setFloat64(1, 56.24);
Output: 56.24

Example 2: 
 

Input: dataview1.setFloat64(1, Math.PI); 
Output: 3.141592653589793

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 56.24 at slot 1
   dataview1.setFloat64(1, 56.24);
   document.write(dataview1.getFloat64(1));
    
</script>

Output: 
 

56.24

Code #2: 
The below code sets the value of PI using Math.PI and gives the output as the value of PI. 
 

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: 
 

3.141592653589793

Code #3: 
When there is no data to be stored then it gives the output as 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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