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JavaScript dataView.setInt8() Method
  • Last Updated : 16 Sep, 2020

Below is the example of the dataView.setInt8() Method.

  • Example:




    <script>
       var buffer = new ArrayBuffer(20);
      
       var dataview1 = new DataView(buffer, 0, 10);
       dataview1.setInt8(1, 12);
       document.write(dataview1.getInt8(1));
    </script>
  • Output:
    12

The dataView.setInt8() is an inbuilt function in dataView which is used to store a signed 8-bit integer at the specified location i.e, at byte offset from the start of the dataView.

Syntax:

dataView.setInt8(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.setInt8(1, 56); 
Output: 56

Example 2:

Input: dataview1.setInt8(1, Math.PI); 
Output: 3

JavaScript code to show the working of this method:
Code #1:




<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 at slot 1
   dataview1.setInt8(1, 56);
   document.write(dataview1.getInt8(1));
     
</script>

Output:

56

Code #2:
This function does not accept float value; that is why it convert float value to integer value. It can be seen from the output of the below program it should give output as 3.14 (the value of PI) but this function convert this value to 3.




<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.setInt8(1, Math.PI);
   document.write(dataview1.getInt8(1) + "<br>");
     
</script>

Output:

3

Code #3:
When there is no data to be stored then it gives output as zero (0).




<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.setInt8(1);
   document.write(dataview1.getInt8(1) + "<br>");
     
</script>

Output:

0

Supported Browsers:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera



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