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Sample Node js Program

Node.js provides run time environment to execute JavaScript code. You can put the code in a file with .js extension and execute it using command line or through Visual Studio code. For example here is a sample JavaScript Code. Save this code in demo.js file: 

Example 1

var a = 5;
var b = 4;
var sum = a + b;
console.log("Sum of the numbers is " + sum);
You can use command line to run this JavaScript code:
C:\Users\mail2\Downloads\Sample>node demo.js
Sum of the numbers is 9
Here is the screenshot of running the same code through VS Code.

Example 2

In this example, we are going to use local module using one JavaScript file and load it into another JavaScript file using require function.

Local module: calculatorFn.js
function add(a, b) {
    return a + b;
}

function subtract(a, b) {
    return a - b;
}

function multiply(a, b) {
    return a * b;
}

function divide(a, b) {
    return a / b;
}

exports.add = add
exports.subtract = subtract
exports.multiply = multiply
exports.divide = divide
demo.js
const mod = require('./myModule');
const calc = require('./calculatorFn');
var a = 5;
var b = 4;
console.log("Sum of the numbers is " + calc.add(a,b));
console.log("Difference of the numbers is " + calc.subtract(a,b));
console.log("Multiplication of the numbers is " + calc.multiply(a,b));
console.log("Division of the numbers is " + calc.divide(a,b));
Results:


Source Code:
https://github.com/it-code-lab/nodejs-sample-program


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