Area

.gitignore

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+node_modules

area.js

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+function squareArea(side) {
+    return side * side
+}
+
+function rectArea(length, width) {
+    return length * width
+}
+
+function circleArea(radius) {
+    return radius * radius * Math.PI 
+}
+
+function triangleArea(height, base) {
+    return height * base / 2
+}
+
+module.exports = {
+    squareArea,                     //it's like "squareArea": squareArea,
+    rectArea,
+    circleArea,
+    triangleArea
+}

main.js

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+const reader = require('readline-sync')
+const area = require("./area.js")
+
+console.log("Supported Shapes:")
+console.log("1: Circle 2: Rectange")
+console.log("3: Square 4: Triangle")
+
+const option = reader.questionInt("What is your choice? ")
+let result;
+
+switch(option) {
+    case 1:
+        const radius = reader.questionInt(" radius = ")
+        result = area.circleArea(radius)
+        break;
+    case 2:
+        const width = reader.questionInt(" width = ")
+        const length = reader.questionInt(" length = ")
+        result = area.rectArea(length, width)
+        break;
+    case 3:
+        const side = reader.questionInt(" side = ")
+        result = area.squareArea(side)
+        break;
+    case 4:
+        const height = reader.questionInt(" height = ")
+        const base = reader.questionInt(" base = ")
+        result = area.triangleArea(height, base)
+        break;
+    default:
+        console.log("Type not supported")    
+}
+
+if(result) {
+    console.log("result = " + result)
+} else {
+    console.log("Type not supported!")
+}
+
+/*const area = require("./area.js")
+const result = area.rectArea(6, 2)
+console.log("result is = " + result)*/

package.json

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+{
+  "name": "area",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}