chapter4.js

// let a = 10;

// {
// // TDZ intialized
// // TDZ cont...
// console.log(somevalue);// // TDZ cont...
// let somevalue = 100; // // TDZ ends
// // No TDZ
// }


var sideEffect = 110;
function sideEffectFun(number) {  // Impure function
//    return sideEffect+=number;  // sideEffect= sideEffect + number
   console.log();  // side effect due to console object as this can be change the state
}

console.log(sideEffectFun(20));

const sum = function(n1,n2) {  // Pure function
    return n1+n2;
}

console.log(sum(4,3));