udittyagi

const str = 'zanè';
const buf = Buffer.from(str);
console.log('String data', str);
console.log('String Length', str.length);
console.log('Buffer data', buf);
console.log('Buffer Length', buf.length);

udittyagi

const originalBuff = Buffer.from('Node is Best');
console.log('originalBuff Before', originalBuff.toString());
const slicedBuff = originalBuff.slice(0, 4);
slicedBuff[0]++;
console.log('originalBuff After', originalBuff.toString());
console.log('slicedBuff', slicedBuff.toString());

udittyagi

const sum = (a, b) => {
  return a + b;
};

const result = sum(2, 3)
console.log(result)

udittyagi

(function () {
  const sum = (a, b) => {
    return a + b;
  };
  const result = sum(2, 3)
  console.log(result)
})()

sum(5, 8) // ReferenceError: sum not defined

udittyagi

const exportObj = {};
(function () {
  const sum = (a, b) => {
    return a + b;
  };
  const result1 = sum(2, 3)
  console.log(result1) //5
  exportObj.sum = sum;
})()
const result2 = exportObj.sum(5, 8)

udittyagi

(function (exports, require, module, __filename, __dirname) {
  // Module code actually lives in here
  const sum = (a, b) => {
    return a + b;
  };

  const result = sum(2, 3)
  console.log(result)
});

udittyagi

console.log('Arguments given by node', arguments)

udittyagi

const sum = (a, b) => {
  return a + b;
};
const multiply = (a, b) => {
  return a * b
};
exports.multiply = multiply;

udittyagi

exports = {} // don't do this

const obj = {
  firstName: 'Udit',
  lastName: 'Tyagi'
}
// don't export items like this, as assigning will change the reference
exports = obj

//To correctly export, here we are not changing reference of exports

udittyagi

const os = require('os'); //node's core module
const express = require('express') // third party module
const operations = require('./operations.js'); //local module

//Do something with these modules
const result1 = operations.multiply(2, 4);
console.log('Multiply Result: ', result1)// 8

const result2 = operations.sum(2, 3);// Error, as it is not exported.
console.log('Sum Result: ', result2)