nodejs - 로또 프로그램

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nodejs 과제 겸으로 로또 프로그램을 작성해보았습니다.

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/**
 * top.js, main()
 */

"use strict";

const lotto = require('./lotto');
const print = text => console.log(text);


const lottoNum = lotto.run();
let index = 0;

print(`\n┌─☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ─┐\n│`);

lottoNum.forEach((data)=>{
    print(`│ ${++index} 번째 번호 : ${data}`);
    for(let i = 0; ++i < 2000000000;);	// show delay
});

print(`│\n└─※ 당첨 번호 : [ ${lottoNum} ]`)

/**
 * lotto.js
 */

"use strict";

const { random } = require('./random');

const DATA_NUM = [1,2,3,4,5,6,7,8,9,
    10,11,12,13,14,15,16,17,18,19,
    20,21,22,23,24,25,26,27,28,29,
    30,31,32,33,34,35,36,37,38,39,
    40,41,42,43,44,45];
const BALL_MAX = 6;

/**
 * return -> [], length : 6
 */
const run = () => {
    let numArray = DATA_NUM;
    let result = [];

    for(let i = -1; ++i < BALL_MAX;){
        let num = random(numArray.length);
        result[i] = numArray[num];
        numArray.splice(num, 1);
    }
    return result;
}

module.exports = {
    run,
}

/**
 * random.js
 */

"use strict";

const date = new Date();
const seed = Number.parseInt(`${date.getMilliseconds()}${date.getHours()}${date.getMinutes()}${date.getFullYear()}${date.getSeconds()}${date.getMonth()}`);

/**
 * range -> not 0
 * return -> 0 ~ range - 1
 */
const random = (range) => {
    return ((Math.floor(Math.random() * range) + 1) ^ seed >>> 1) % range;
}


module.exports = {
    random,
}

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