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# Fibonacci series using mem cache for effiecient solution
# Author: Jamal Uddin
# Date: 29.01.2018

def fib(n, _cache={}):
  if n in _cache:
    return _cache[n]
  elif n > 1:
    return _cache.setdefault(n, fib(n - 1) + fib(n - 2))
  return n

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// Price for groceries
var potatoPrice = 20;
var tomatoPrice = 30;
var fishPrice = 160;

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// Price for groceries
var potatoPrice = 20;
var tomatoPrice = 30;
var fishPrice = 160;

// Output
console.log(potatoPrice);    // Output should be: 20
console.log(tomatoPrice);    // Output should be: 30
console.log(fishPrice);      // Output should be: 160

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// Previuos groceries prices
var potatoPrice = 20;
var tomatoPrice = 30;
var fishPrice = 160;

console.log(potatoPrice);    //should be present: 20

// If we want to change potato price
potatoPrice = 25;
console.log(potatoPrice);    //should be present: 25

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let mango;  // Declaration or Initialization
mango = "We are mango people";  // String type data asisgned in mango variable

// Or you can declare or initialize and assign value all in onec.
let myNumber = 32;
let myString = 'Hello, World!';
let myBoolean = true;

// If you want to see the output
console.log(mango); // We are mango people

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// const type variable declaration
const PI = 3.14; // Global value of pi
const TAX_RATE = 8.5; // maybe your tax rate 8.5%
const INTEREST_RATE = 12; // Bank interest rate is 12%

// output
console.log(PI); // 3.14
console.log(TAX_RATE); // 8.5
console.log(INTEREST_RATE); // 12

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// Global scope
var num = 5;

function globalVar() {
  console.log(num); // num = 5
  num = 8;
  console.log(num); // num = 8
}

console.log(num); // num = 5

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let id = function() {
  const num = 10;
  console.log(num); // output: 10
};

console.log(id()); // 10
console.log(num); // ReferenceError: num is not defined

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var singleQuotes = 'This is a string in single quotes.';
var doubleQuotes = "This is a string in double quotes.";

let txtOne = "I'm from Dhaka, Bangladesh"; // I'm from Dhaka, Bangladesh
let txtTwo = 'I'm a programmer'; // SyntaxError: Unexpected identifier

// If you want to pass this Error let's do this way
let txtTwo = 'I\'m a programmer';
console.log(txtTwo); // I'm a programmer

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var num1 = 30;
var num2 = 5 / 0;   // will return Infinity
var num3 = -5 / 0;  // will return -Infinity
let x = 20 / "Shark"; // Will return NaN
const PI = 3.14;

console.log(num1); // Output: 30
console.log(num2); // Output: Infinity
console.log(num3); // Output: -Infinity
console.log(x); // Output: NaN