JavaScript DataView.getFloat64() Method

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.

Below are examples of the DataView.getFloat64() Method. 

Example 1: When a positive float number passed as a parameter  

var buffer = new ArrayBuffer(20); 
var dataview1 = new DataView(buffer, 0, 10); 
dataview1.setFloat64(1, 12.01); 
console.log(dataview1.getFloat64(1) + "<br>"); 

Output:  

12.01

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 56.34 at slot 1
dataview1.setFloat64(1, 56.34);
console.log(dataview1.getFloat64(1));

Output:  

56.34

Example 3: Not only float value but also a math function like Math.PI can be taken as the parameter of the function.  

// 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);
console.log(dataview1.getFloat64(1));

Output: 

3.1415927410125732

Example 4:  When nothing as data is used to store then it returns NaN i.e, not a number. 

// 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);
console.log(dataview1.getFloat64(1));

Output:  

NaN

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.