node.js Stream readable.readableObjectMode用法及代碼示例

Readable Stream中的可讀.visibleObjectMode屬性，用於檢查流的objectMode。

用法:

readable.readableObjectMode

返回值：它返回布爾值。

以下示例說明了Node.js中visible.visibleObjectMode屬性的使用：

範例1：

// Node.js program to demonstrate the      
// readable.readableObjectMode Property 
   
// Accessing readable stream module 
const Readable = require('readable-stream').Readable; 
  
// Constructing readable stream and 
// setting the objectMode value 
const readable = Readable({objectMode:true}); 
  
// Defining ._read method 
readable._read = () => {}; 
  
// Instructions for reading data 
readable.on('readable', () => { 
  let chunk; 
  
  // Using while loop and calling 
  // read method with parameter 
  while (null !== (chunk = readable.read(4))) { 
  
    // Displaying the chunk 
    console.log(`read:${chunk}`); 
  } 
}); 
  
// Calling readableObjectMode 
// Property 
readable.readableObjectMode; 
console.log("objectMode is true!!");

輸出：

objectMode is true!!

範例2：

// Node.js program to demonstrate the      
// readable.readableObjectMode Property 
   
// Accessing readable stream module 
const Readable = require('readable-stream').Readable; 
  
// Constructing readable stream and 
// setting the objectMode value 
const readable = Readable({objectMode:false}); 
  
// Defining ._read method 
readable._read = () => {}; 
  
// Instructions for reading data 
readable.on('readable', () => { 
  let chunk; 
  
  // Using while loop and calling 
  // read method with parameter 
  while (null !== (chunk = readable.read(4))) { 
  
    // Displaying the chunk 
    console.log(`read:${chunk}`); 
  } 
}); 
  
// Calling readableObjectMode 
// Property 
readable.readableObjectMode; 
console.log("objectMode is false!!");

輸出：

objectMode is false!!

參考： https://nodejs.org/api/stream.html#stream_readable_readableobjectmode

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