Node.js Buffer.readDoubleLE() Method

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

Buffer.readDoubleLE( 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 little endian format. Below examples illustrate the use of buf.readDoubleLE() Method in Node.js: Example 1: javascript

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

// Creating a buffer of given size
const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);

// Display the result
console.log(buf.readDoubleLE(0));
console.log(buf);

Output:

5.447603722011605e-270
<Buffer 01 02 03 04 05 06 07 08>

Example 2: javascript

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

// Creating a buffer of given size
const buf = Buffer.from([11, 22, 33, 44, 55, 66, 77, 88]);

// Display the result
console.log("Functions of Buffer.readDoubleLE(int)");
console.log(buf.readDoubleLE(55));
console.log(buf);

Output:

Functions of Buffer.readDoubleLE(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 55
    . . .

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_readdoublele_offset