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  • Methods of Exporting Constructs Using exports

Methods of Exporting Constructs Using exports

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In the previous segment, you learnt that exports keyword is a shortcut to using module.exports.

 

Now in this segment, you will understand this better with the help of a code.

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The code which you looked in the previous video is given below:

 

circle Module (Method 1):

const PI = 3.14;

const calculateArea = r => PI * r * r;
const calculateCircumference = r => 2 * PI * r;

// using individual exports statement to export each construct one by one
exports.calculateArea = calculateArea;
exports.calculateCircumference = calculateCircumference;

 

circle Module (Method 2):

const PI = 3.14;

// using exports statement while defining a function
exports.calculateArea = r => PI * r * r;
exports.calculateCircumference = r => 2 * PI * r;

 

app Module:

const circle = require('./circle.js');
const area = circle.calculateArea(8);
const circumference = circle.calculateCircumference(8);

console.log(`Area = ${area}, Circumference = ${circumference}`);

 

Output:

Area = 200.96, Circumference = 50.24

 

In the following video, you will use the last method which you have learnt in order to export constructs and see whether the output is as expected or not.

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The code which you looked in the previous video is given below:

 

circle Module (Method 3):

const PI = 3.14;

const calculateArea = r => PI * r * r;
const calculateCircumference = r => 2 * PI * r;

// using single exports statement to export all constructs at once
exports = {
   calculateArea: calculateArea,
   calculateCircumference: calculateCircumference
}

// fixing the reference by assigning object inside exports to module.exports
module.exports = exports;

 

app Module:

const circle = require('./circle.js');
const area = circle.calculateArea(8);
const circumference = circle.calculateCircumference(8);

console.log(`Area = ${area}, Circumference = ${circumference}`);

 

Output:

Area = 200.96, Circumference = 50.24