// string concatenation

let a = 2 + 2 + '1';

console.log(a); // 41

let b = '1' + 2 + 2;

console.log(b); // 122

// unary conversion using +

let c = "";

console.log(+c); // 0

let val1 = "2";

let val2 = "3";

console.log(+val1 + +val2); // 5

console.log(+false);

// chaining assignment

let x,y,z;

x = y = z = 5;

console.log(x,y,z); // 5 5 5

// increment/decrement

let counter = 5;

console.log(++counter); // 6

console.log(counter++); //6

console.log(counter); //7

console.log(--counter); // 6

console.log(counter--); //6

console.log(counter); //5

//comma operators

let comma = (1+2, 3+4);

console.log(comma); // 7 (returns only the last result)

let sym1 = Symbol("id");

let sym2 = Symbol.for("id"); // if doesn't exist creats new one

let str = "Hello \rworls";

console.log(str)

// Example to find common elements between 2 arrays.

let ar1 = [1,2,3,4,5];

let ar2 = [4,5,6];

let ar = ar1.filter(function(val) {

for(let ke of this) {

if (val == ke)

return true;

}

}, ar2);

console.log( ar );