Node.js v8.Deserializer.readDouble() Method

The v8.Deserializer.readDouble() method is an inbuilt application programming interface of the v8.Deserializer module which is used to read JS number from a buffer. For use inside of custom Deserializer._readHostObject().

Syntax:

v8.Deserializer.readDouble();

Parameters: This method does not accept any parameters.

Return Value: This method reads JS number from a buffer and returns it.

Below examples illustrate the use of v8.Deserializer.readDouble() method in Node.js:

Example 1: Filename: index.js

// Accessing v8 module
const v8 = require('v8');
const serializer = new v8.Serializer();

// Calling v8.serializer.writeDouble()
serializer.writeDouble(57839.83475);

// Calling v8.deserializer.readDouble()
const deserializer = new v8.Deserializer(
            serializer.releaseBuffer());

console.log(deserializer.readDouble());

Run index.js file using the following command:

node index.js

Output:

57839.83475

Example 2: Filename: index.js

// Accessing v8 module
const v8 = require('v8');
const serializer = new v8.Serializer();

// Calling v8.serializer.writeDouble()
console.log(serializer.releaseBuffer());
serializer.writeDouble(29698.674673);
buff = serializer.releaseBuffer();
console.log("buffer data is:");
console.log(buff);

// Calling v8.deserializer.readDouble()
const deserializer = new v8.Deserializer(buff);
console.log("deserialized data: ");
console.log(deserializer.readDouble());

Run index.js file using the following command:

node index.js

Output:

<Buffer >
buffer data is:
<Buffer a0 a9 d7 2d ab 00 dd 40>
deserialized data:
29698.674673

Reference: https://nodejs.org/api/v8.html#v8_deserializer_readdouble