summary.js

/* 
1.1 varialbe (let, const) three types of variable
1.2 condition (<,>, ===, !==, <=, >=, &&, ||, if-else)
1.3 array: declare, length, index, push, pop, indexOf, includes, 
1.4 for loop, while loop
1.5 function return, parameter
1.6 object: property, including array, object
=============================================
ES6
1. template string ${}
2. spread(...) 
2.1 copy an array and then add a new element to an array
2.2 use filter to remove an element from an array
3. Arrow FUnction
3.1 no parameter()
3.2 singlie parameter
3.3 multiple parameter()
3.4 multi line 
4. destructuring: object destructuring array destructuring
5. object shorthand
6. function parameter default value
7. optional chaining ?.
-----------------------------------------------
Browser API
1. Localstorate, sessionstorate
2. location API
3. History API
4. Fetch
================================================
Others
1. Array: map, forEach, filter, find
2. Ternary operation
3. Logican and, logical or
4. JSON(stringify, parse)

*/


const x = 50;
const y = 100;
const obj = {
    x:x, 
    y:y
};

const obj1 ={x,y};

const name = 'Solimullah';
const area = 'Dhaka';
const nobab ={
    name: name,
    area:area
}
const nobab2 ={name, area};