JavaScript dataView.setUint8() Method

The dataView.setUint8() is an inbuilt function in dataView that is used to store an unsigned 8-bit integer at the specified location i.e, at byte offset from the start of the dataView. 

Syntax:  

dataView.setUint8(byteOffset)

Parameters: It has the parameter byteOffset which is offset in a byte and it says from the start of the view where to read the data.

Return value: This function does not return anything.

Below are examples of the dataView.setUint8() Method. 

Example 1:  

var buffer = new ArrayBuffer(20); 

var dataview1 = new DataView(buffer, 0, 10); 

dataview1.setUint8(1, 12); 
console.log(dataview1.getUint8(1)); 

Output:  

12 

Example 2: 

// 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.setUint8(1, 56);
console.log(dataview1.getUint8(1));

Output:  

56

Example 3: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.  

// 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.setUint8(1, Math.PI);
console.log(dataview1.getUint8(1));

Output:  

3

Example 4: When nothing as data is used to store then it gives the output as zero (0).  

// 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.setUint8(1);
document.write(dataview1.getUint8(1));

Output: 

0

We have a complete list of Javascript Date Objects, to check those please go through this JavaScript dataView Complete Reference article.

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

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.