Node.js Buffer.readDoubleBE() Method (original) (raw)

Last Updated : 13 Oct, 2021

The Buffer.readDoubleBE() Method in Node.js is used to read a 64-bit double from the buffer at the given offset with the Big Endian format. Syntax:

Buffer.readDoubleBE( offset )

Parameters: This method accepts single parameter offset which holds the number of bytes to skip before starting to read. The value of offset lies between 0 <= offset <= buf.length - 8. Its default value is 0.Return Value: It returns an integer value in big endian format. Below examples illustrate the use of buf.readDoubleBE() Method in Node.js:Example 1:

javascript `

// Node program to demonstrate the
// Buffer.readDoubleBE() method

// Creating a buffer of given size const buf = Buffer.from([10, 20, 30, 40, 50, 60, 70, 80]);

// Display the result console.log("Functions of Buffer.readDoubleBe(int)"); console.log(buf.readDoubleBE(0)) console.log(buf);

`

Output:

Functions of Buffer.readDoubleBe(int) 4.0888790063059496e-260 <Buffer 0a 14 1e 28 32 3c 46 50>

Example 2: javascript `

// Node program to demonstrate the // Buffer.readDoubleBE() method

// Creating a buffer of given size const buf = Buffer.from([100, 200, 300, 400, 500, 600, 700, 800]);

// Display the result console.log("Functions of Buffer.readDoubleBe(int)"); console.log(buf.readDoubleBE(5)) console.log(buf);

` Output:

Functions of Buffer.readDoubleBe(int) internal/buffer.js:72 throw new ERR_OUT_OF_RANGE(type || 'offset', ^

RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 and <= 0. Received 5 . . .

Note: The above program will compile and run by using the node index.js command.Reference: https://nodejs.org/docs/latest-v11.x/api/buffer.html#buffer_buf_readdoublebe_offset