// 1 - The + operator
const plus = () => {
    // get timestamp in a shorthand syntax
    console.log(+new Date());
    // boolean to integer conversion
    console.log(+true);
    console.log(+false);
    // scientific notation conversion
    console.log(+"1e8");
    console.log(+"1.6e-2");
    // my favorite, random generation
    const random = {
    valueOf: () => Math.floor(Math.random() * 100),
    };
    console.log(+random);
    console.log(+random);
    console.log(+random);
};

// 2- The debugger statement
// run in the browser or with --inspect for node
const debug = () => {
    const bubbleSort = (arr) => {
        const length = arr.length;
        for (let i = 0; i < length; i++) {
            for (let j = 0; j < length - i - 1; j++) {
                if (arr[j] > arr[j + 1]) {
                    debugger;
                    [arr[j], arr[j + 1]] = [arr[j + 1], arr[j]];
                }
            }
        }
    return arr;
    };
    console.log(bubbleSort([8, 2, 19, 8, 4, 5, 2]));
    // 2, 2, 4, 5, 8, 8, 19
};

// 3- The comma operator
const comma = () => {
    let money = 10;
    const hasStudied = false;
    const relax = () => console.log("relax");
    const study = () => console.log("study");
    hasStudied ? (money++, relax()) : ((money /= 2), study());
    console.log(money); // study 5

    // multiple variables in loops
    for (let i = 1, j = 2; i + j < 10; i++, j++) {
    console.log(i, j);
    }
    // 1 2; 2 3; 3 4; 4 5;

    // for debugging purposes
    const coins = [
    { value: 4, currency: "EUR" },
    { value: 1, currency: "USD" },
    { value: 5, currency: "BTC" },
    ];
    const countOddCoins = (coins) => {
        let oddCoins = 0;
        coins.forEach(({ value, currency }) => {
          if (value % 2 != 0) {
            oddCoins++, console.log(`${oddCoins} with ${currency}`);
            // 1 with USD
            // 2 with BTC
          }
        });
        return oddCoins;
    };
    console.log(countOddCoins(coins)); // 2
};

// 4- The Set() Object
const setDemo = () => {
    // remove duplicates from Array  
    const arr = [1, 1, 7, 5, 6, 6, 6, 8, 7];
    // old way
    let noDup = arr.filter((a, b) => arr.indexOf(a) === b);
    // new way
    noDup = [...new Set(arr)];
    console.log(noDup);
    // 1 7 5 6 8

    // traditional set operation
    let a = new Set("hello world!");
    // 'h''e''l''o'' ''w''r''d''!'
    let b = new Set("medium is cool!");
    // 'm''e''d''i''u'' ''s''c''o''l''!'
    // intersection
    const intersection = (a, b) => {
        let intersection = new Set();
        for (let elem of b) {
            if (a.has(elem)) {
                intersection.add(elem);
            }
        }
        return intersection;
    }
    console.log(intersection(a, b));
    // 'e''d'' ''o''l''!'
};

// 5- Web APIs (to run in the browser)
const webapi = () => {
    // Performance API
    const start = performance.now();
    const fib = n => {
        if(n <= 1) return n;
        return fib(n-1) + fib(n-2);
    }
    fib(15);
    const end = performance.now();
    console.log(end - start);
    // 0.1699999994598329 (on my machine)

    // Navigator API
    navigator.geolocation.getCurrentPosition(pos => {
        const { coords: { latitude, longitude } } = pos;
        console.log(latitude, longitude);
        // 48.9080891 2.2699974
    });
}

// Uncomment to run part
// plus()
// debug()
// comma()
// setDemo();
// webapi()