Untitled

console.log(typeof NaN);


let a = [1, 2, 3];
let b = a;
b[0] = 4;
console.log(a);


console.log('5' - 2);



function foo() {
    return
    {
        bar: "Hello"
    };
}
console.log(foo());



const obj = { a: 1, b: 2 };
console.log(Object.keys(obj).map(key => obj[key]));



console.log([1, 2] == [1, 2]);



let x = 10;
function test() {
    console.log(x);
    let x = 20;
}
test();



const f = (x) => {
    return (y) => {
        return x + y;
    };
};
const add5 = f(5);
console.log(add5(10));



console.log((1, 2, 3));



let count = 0;
const increment = () => {
    count++;
    return count;
};
console.log(increment());
console.log(increment());



const arr = [1, 2, 3, 4];
const doubled = arr.map(n => n * 2);
console.log(arr);



console.log(1 + '2' + 3);



const a = { name: 'John' };
const b = a;
b.name = 'Jane';
console.log(a.name);



console.log(0.1 + 0.2 === 0.3);



let x = [1, 2, 3];
let y = x;
y.push(4);
console.log(x);



console.log((function() {
    return
    {
        message: "Hello"
    };
})());



console.log(typeof ({}));


console.log(typeof "Hello" == "string");


let obj = { x: 1 };
let obj2 = Object.create(obj);
console.log(obj2.x);


function outer() {
    let count = 0;
    function inner() {
        count++;
        return count;
    }
    return inner;
}
const counter = outer();
console.log(counter());
console.log(counter());


let x = 1;
if (function f() {}) {
    x += typeof f;
}
console.log(x);


const nums = [1, 2, 3];
const newNums = [...nums];
newNums[0] = 4;
console.log(nums);


console.log(3 == 3.0);


console.log(typeof (1 + '1'));


const obj = {
    prop: 'value',
    getProp() {
        return this.prop;
    }
};
console.log(obj.getProp());


let result = (function() {
    return this || 'default';
})();
console.log(result);


const a = 1;
const b = a;
console.log(b === a);


let str = "Hello";
str[0] = "h";
console.log(str);



console.log([2] == [2]);


const arr = [1, 2, 3];
arr[10] = 10;
console.log(arr.length);


const foo = {
    bar: 1,
    baz: function() {
        console.log(this.bar);
    }
};
const fn = foo.baz;
fn();


let sum = 0;
for (let i = 0; i < 5; i++) {
    setTimeout(() => {
        sum += i;
    }, 100);
}
setTimeout(() => console.log(sum), 200);


console.log(1 + 2 + '3' + 4 + 5);


let a = { x: 1 };
let b = { x: 1 };
console.log(a == b);


const a = [1, 2, 3];
const b = a;
b.push(4);
console.log(a);


const obj = { a: 1 };
Object.freeze(obj);
obj.a = 2;
console.log(obj.a);


const numbers = [1, 2, 3];
numbers.length = 0;
console.log(numbers);


console.log(1 < 2 < 3);


const fn = () => {
    return { key: 'value' };
};
console.log(fn());


let x = 0;
setTimeout(() => {
    console.log(x);
}, 0);
x++;


console.log((2, 3, 4));


const fn = () => {
    return () => {
        return 5;
    };
};
console.log(fn()());


let num = 1;
const obj = {
    num: 2,
    getNum: function() {
        return this.num;
    }
};
console.log(obj.getNum());


const arr = [1, 2, 3];
arr.length = 2;
console.log(arr);


console.log(null == undefined);


console.log(0 == '0');


const func = function() {
    return
    {
        name: "John"
    };
};
console.log(func());


console.log('a' + 1 - 1);


const arr = [1, 2, 3];
console.log(arr[3] === undefined);


const obj = { a: 1, b: 2 };
console.log(Object.entries(obj));