**Endianness** defines the order of the sequence of multibyte data types (int, float, etc.) stored in the computer memory.

* In little-endian, the last byte of the binary representation of the multibyte data type is stored first. 

* In big-endian, the first byte of the binary representation of the multibyte data type is stored first. 

The **`Buffer.writeDoubleBE()`** writes a big-endian double value to a buffer at a specified offset. 


# Syntax 
The `Buffer.writeDoubleBE()` method is defined as follows:



# Parameters
The method takes up to two parameters:

* **`value`** - this is the 4-byte floating-point number to be written to the buffer. If the value is not a valid 64 bits big-endian number, the behavior is undefined. 

* **`offset`** - the number of bytes to skip before starting the write. The default value of offset is 0. 


> `offset` is an optional parameter. The `offset` must satisfy the condition: 0 <= offset <=  #key# `Buffer.length`: returns the number of bytes in the buffer #key# - 8.

# Return value
The `Buffer.writeDoubleBE()` method returns the sum of the `offset` and the number of written bytes.

# Example
The code below shows the use of the `Buffer.writeDoubleBE()` method. We allocate an 8-byte buffer and write the value 123.123 at offset 0. We then display the buffer. 

//Allocate 8 bytes buffer
const buf = Buffer.allocUnsafe(8);

//Write 123.123 to buffer at offset 0
buf.writeDoubleBE(123.123, 0);

//Display buffer
console.log(buf);

What is Buffer.writeDoubleBE() method in Node.js?

Writes a big-endian double to a buffer at a specified offset, returning the sum of offset and bytes written.