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What is global objects ?

uses of global objects in node.js

__filename

The __filename represents the filename of the code being executed. it return the name of the file.

File Name :

console.log( __filename );

__dirname

The __dirname represents the name of the directory that the currently executing script resides in.

File Name :

console.log( __dirname );

setTimeout(cb, ms)

The setTimeout(cb, ms) global function is used to run callback cb after at least ms milliseconds.

File Name :

function say_hello() {
console.log( "Hello, Ittutorial!");
}

// Now call above function after 5 seconds
setTimeout(say_hello, 5000);

clearTimeout(t)

The clearTimeout(t) global function is used to stop a timer that was previously created with setTimeout().

File Name :

function say_hello() {
console.log( "Hello, Sana!");
}

// Now call above function after 2 seconds
var obj = setTimeout(say_hello, 2000);

// Now clear the timer
clearTimeout(obj);

setInterval(cb, ms)

The setInterval(cb, ms) global function is used to run callback cb repeatedly after at least ms milliseconds.

File Name :

function say_hello() {
console.log( "Hello, Sana!");
}
// Now call above function after 2 seconds
setInterval(say_hello, 2000);

Console

Node.js console is a global object and is used to print different levels of messages to stdout and stderr.

File Name :

  • console.log([data][, ...])
  • console.info([data][, ...])
  • console.error([data][, ...])
  • console.warn([data][, ...])
  • console.dir(obj[, options])
  • console.time(label)
  • console.timeEnd(label)
  • console.trace(message[, ...])


    • console.info("Program Started");

    var counter = 10;
    console.log("Counter: %d", counter);

    console.time("Getting data");
    //
    // Do some processing here...
    //
    console.timeEnd('Getting data');

    console.info("Program Ended")

    Process

    The process object is a global object and can be accessed from anywhere. There are several methods available in a process object.

    File Name :


    Process Events

    The process object is an instance of EventEmitter and emits the following events

    File Name :

  • exit
  • beforeExit
  • uncaughtException
  • Signal Events

    • process.on('exit', function(code) {
    // Following code will never execute.
    setTimeout(function() {
    console.log("This will not run");
    }, 0);

    console.log('About to exit with code:', code);
    });
    console.log("Program Ended");

    File Name :

    // Printing to console
    process.stdout.write("Hello World!" + "\n");

    // Reading passed parameter
    process.argv.forEach(function(val, index, array) {
    console.log(index + ': ' + val);
    });

    // Getting executable path
    console.log(process.execPath);

    // Platform Information
    console.log(process.platform);

    Methods :-

    File Name :

  • abort()
  • chdir(directory)
  • cwd()
  • exit([code])
  • getgid()
  • setgid(id)
  • getuid()
  • setuid(id)
  • getgroups()
  • setgroups(groups)
  • initgroups(user, extra_group)
  • kill(pid[, signal])
  • memoryUsage()
  • nextTick(callback)
  • umask([mask])
  • uptime()
  • hrtime()

    • File Name :

    // Print the current directory
    console.log('Current directory: ' + process.cwd());

    // Print the process version
    console.log('Current version: ' + process.version);

    // Print the memory usage
    console.log(process.memoryUsage());





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