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app.js
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app.js
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// function statement
function func() {}
// Function expression
const myFn = function () {};
// Fat Arrow function
const myFatArrowFn = () => {};
// Pure Function
function sum(a, b) {
return a + b;
}
sum(10, 20); // 30
// // Side effect
// let limit = 100;
// function changeLimit() {
// limit = 500;
// }
// console.log(changeLimit(limit)); // undefined
// console.log(limit); // 500
// Pure
// const arr = [1, 2, 3];
// function add(arr, data) {
// arr = [...arr, data]
// return arr;
// }
// Side Effect
const arr = [1, 2, 3];
function add(data) {
arr.push(data);
}
// Impure Function
function log(msg) {
console.log(msg);
}
// Higher order function
function generateTwoRandNumber(max, cb) {
const random1 = Math.floor(Math.random() * max);
const random2 = Math.floor(Math.random() * max);
const result = cb(random1, random2);
return result;
}
// const cb = function (rand1, rand2) {
// console.log(rand1, rand2);
// };
// generateTwoRandNumber(100, cb);
// console.log(generateTwoRandNumber(1000, (rand1, rand2) => rand1 + rand2));
// console.log(generateTwoRandNumber(10, (rand1, rand2) => rand1 * rand2));
// console.log(
// generateTwoRandNumber(10, (rand1, rand2) => rand1 * rand1 + rand2 * rand2)
// );
// function randomSum(max) {
// const random1 = Math.floor(Math.random() * max);
// const random2 = Math.floor(Math.random() * max);
// return random1 + random2; // placeholder
// }
// function randomSub(max) {
// const random1 = Math.floor(Math.random() * max);
// const random2 = Math.floor(Math.random() * max);
// return random1 - random2; // placeholder
// }
// function randomSqrSum(max) {
// const random1 = Math.floor(Math.random() * max);
// const random2 = Math.floor(Math.random() * max);
// return random1 * random1 + random2 * random2; // placeholder
// }
// function sqr(n) {
// return n * n;
// }
// function cube(n) {
// return n * n * n;
// }
function power(p) {
return function (n) {
let result = 1;
for (let i = 1; i <= p; i++) {
result *= n;
}
return result;
};
}
const sqr = power(2);
const cube = power(3);
const power8 = power(8);
console.log('SQR', sqr);
console.log('CUBE', cube);
console.log('Power8', power8);
console.log(power8(2));
console.log(power8(3));
console.log(power8(4));
const a = 10;
function mostOuter() {
function outer() {
console.log(a);
}
}
{
const notScoped = 'scoped';
{
{
{
console.log(notScoped);
}
}
}
}
function A(a) {
console.log('I am A');
if (a >= 10) {
console.log('a = ', a);
}
for (let i = 0; i < a; i++) {
console.log(i);
}
}
function B() {
A(5);
}
function C() {
B();
B();
}
function D() {
C();
A(3);
}
D();
function randomSum(max) {
const random1 = Math.floor(Math.random() * max);
const random2 = Math.floor(Math.random() * max);
t();
function t() {
console.log(test);
}
var test = 'something';
t();
return random1 + random2; // placeholder
}
const r = randomSum(15);
(function (name) {
console.log(name);
})('Nayem');
(() => {
console.log('Test');
})();