Node.js Buffer.includes()方法

原文:https://www . geesforgeks . org/node-js-buffer-includes-method/

缓冲区是一个临时存储器，当数据从一个地方移动到另一个地方时，它存储数据。它就像一个整数数组。

Buffer.includes()方法检查所提供的值是否存在或包含在缓冲区中。

语法:

buffer.includes( value, byteOffset, encoding );

参数:这个方法接受下面列出的三个参数:

  • Value: It holds the value you want to find in the buffer.
  • ByteOffset: is an optional parameter. It refers to the starting index at which the input buffer elements will be searched. The default value is 0.
  • Code: If the required value is a character string, then the code type can also be added. The default value is utf-8.

返回值:该方法根据值返回布尔值“真”或“假”。如果在缓冲区中找到值，则返回真，否则返回假。

下面的例子说明了 Buffer.includes()方法在 Node.js 中的使用:

例 1:

// Node.js program to demonstrate the  
// Buffer.includes() Method 

// Creating a buffer
const buffer = new Buffer('Geek One');

console.log(buffer.includes('Geek'));

输出:

true

例 2:

// Node program to demonstrate the  
// Buffer.includes() Method 

const buffer = Buffer.from(
        'GeeksforGeeks: A computer science portal');

// Started checking the value from index 15 only
const output = buffer.includes('Geek', 15);

console.log(output);

输出:

false

注意:以上程序使用node index.js命令编译运行。

参考:https://nodejs . org/API/buffer . html # buffer _ buf _ includes _ value _ byteofset _ encoding

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