EP-18 | Higher-Order Functions ft. Functional Programming

Author: deep100x

Namaste-JavaScript/Ep-18-Higher-Order-Functions.js

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+// Higher order function : A function which takes another function as a input to itself or returns a function from itself is called...
+// Callback function : A function which is passed in a higher order fucntion is called...
+
+function x () {
+  console.log("Namaste");
+}
+function y (x) {
+  x()
+}
+y(x)  // Hi
+// y is higher orrder function
+// x is callback function
+
+
+// 🟨🚨 DRY Principle  =  Don't Repeat Yourself 🚨
+/*  
+
+const radius = [ 3,1,2,4 ]
+
+
+const calculateArea = (radius) => {
+  const output = []
+  for (let i = 0; i < radius.length; i++)
+  {
+    output.push(Math.PI * radius[ i ] * radius[ i ])
+  }
+  return output
+}
+console.log(calculateArea(radius));
+
+
+const calculateCircumference = function (radius) {
+  const output = []
+  for (let i = 0; i < radius.length; i++)
+  {
+    output.push(2 * Math.PI * radius[ i ])
+  }
+  return output
+}
+console.log(calculateCircumference(radius));
+
+
+const calculateDiameter = function (radius) {
+  const output = []
+  for (let i = 0; i < radius.length; i++)
+  {
+    output.push(2 * radius[ i ])
+  }
+  return output
+}
+console.log(calculateDiameter(radius));
+
+*/
+
+
+// 🟨Functional Programming
+
+const radius = [ 3,1,2,4 ]
+
+const area = function (radius) { return Math.PI * radius * radius }
+const circumference = function (radius) { return 2 * Math.PI * radius }
+const diameter = function (radius) { return 2 * radius }
+
+const calculate = (arr,logic) => {
+  const output = []
+  for (let i = 0; i < arr.length; i++)
+  {
+    output.push(logic(arr[ i ]))
+  }
+  return output
+}
+
+// console.log(radius.map(area));
+
+console.log(calculate(radius,area));
+console.log(calculate(radius,circumference));
+console.log(calculate(radius,diameter));
+