Node.js stats.isFIFO() Method

Last Updated : 7 Oct, 2021
The stats.isFIFO() method is an inbuilt application programming interface of the fs.Stats class which is used to check whether fs.Stats object describes a first-in-first-out (FIFO) pipe or not. Syntax: 
stats.isFIFO();
Parameters: This method does not accept any parameter. Return Value: This method returns a boolean value, which is true if fs.Stats object describes a first-in-first-out (FIFO) pipe, false otherwise. Below examples illustrate the use of stats.isFIFO() method in Node.js: Example 1: javascript 
// Node.js program to demonstrate the   
// stats.isFIFO() Method

// Accessing fs module
const fs = require('fs');

// Calling isFIFO() method from
// fs.Stats class
fs.lstat('./filename.txt', (err, stats) => {
    if (err) throw err;

    // console.log(`stats: ${JSON.stringify(stats)}`);
    console.log(stats.isFIFO());
    if (stats.isFIFO()) {
        console.log("fs.Stats describes a "
            + "first-in-first-out (FIFO) pipe.");
    } else {
        console.log("fs.Stats does not describe a"
            + " first-in-first-out (FIFO) pipe.");
    }
});

fs.stat('./', (err, stats) => {
    if (err) throw err;

    //console.log(`stats: ${JSON.stringify(stats)}`);
    console.log(stats.isFIFO());
    if (stats.isFIFO()) {
        console.log("fs.Stats describes a "
            + "first-in-first-out (FIFO) pipe.");
    } else {
        console.log("fs.Stats does not describe a "
            + "first-in-first-out (FIFO) pipe.");
    }
});
Output: 
false
fs.Stats does not describe a a first-in-first-out (FIFO) pipe.
false
fs.Stats does not describe a a first-in-first-out (FIFO) pipe.
Example 2: javascript 
// Node.js program to demonstrate the   
// stats.isFIFO() Method

// Accessing fs module
const fs = require('fs').promises;

// Calling isFIFO() method from
// fs.Stats class
(async () => {
    const stat = await fs.lstat('./');
    console.log(stat.isFIFO());
})().catch(console.error)
Output: 
false
Note: The above program will compile and run by using the node filename.js command and use the file_path correctly. Reference: https://nodejs.org/api/fs.html#fs_stats_isfifo
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