Javascript 정리 - Advanced

// 모듈, module

var circle = require('./node.circle.js');

console.log( 'The area of a circle of radius 4 is ' + circle.area(4));

// 정규표현식, regular expression

// 시각화 해주는 사이트 : http://regexper.com/

// 정규표현식 실습 : http://www.regexr.com/

var pattern = /a/

// var pattern = new RegExp('a');

console.log(pattern.exec('abcdef')); // ["a"]

console.log(pattern.exec('bcdefg')); // null

console.log(pattern.test('abcdef')); // true

console.log(pattern.test('bcdefg')); // false

console.log('abcdef'.match(pattern)); // ["a"]

console.log('bcdefg'.match(pattern)); // null

console.log('abcdef'.replace(pattern, 'A'));  // Abcdef

var xi = /a/;

console.log("Abcde".match(xi)); // null

var oi = /a/i;

console.log("Abcde".match(oi)); // ["A"];

var xg = /a/;

console.log("abcdea".match(xg));

var og = /a/g;

console.log("abcdea".match(og));

var pattern = /(\w+)\s(\w+)/;

var str = "coding everybody";

var result = str.replace(pattern, "$2, $1");

console.log(result);

var urlPattern = /\b(?:https?):\/\/[a-z0-9-+&@#\/%?=~_|!:,.;]*/gim;

var content = '생활코딩 : http://opentutorials.org/course/1 입니다. 네이버 : http://naver.com 입니다. ';

var result = content.replace(urlPattern, function(url){

    return '<a href="'+url+'">'+url+'</a>';

});

console.log(result);

// 함수, function, 유효 범위

for(var i = 0; i < 1; i++){

    var name = 'coding everybody';

}

console.log(name);

var i = 5;

function a(){

    var i = 10;

    b();

}

function b(){

    console.log(i);

}

a();

// function, value, 값으로서의 함수, 콜백, callback

function cal(func, num){

    return func(num)

}

function increase(num){

    return num+1

}

function decrease(num){

    return num-1

}

console.log(cal(increase, 1));

console.log(cal(decrease, 1));

function cal(mode){

    var funcs = {

        'plus' : function(left, right){return left + right},

        'minus' : function(left, right){return left - right}

    }

    return funcs[mode];

}

console.log(cal('plus')(2,1));

console.log(cal('minus')(2,1));

var process = [

    function(input){ return input + 10;},

    function(input){ return input * input;},

    function(input){ return input / 2;}

];

var input = 1;

for(var i = 0; i < process.length; i++){

    input = process[i](input);

}

console.log(input);

var numbers = [20, 10, 9,8,7,6,5,4,3,2,1];

console.log(numbers.sort(function (a, b){

    return b-a;

})); // array, [20,10,9,8,7,6,5,4,3,2,1]

// 클로저, closure

function outter(){

    var title = 'coding everybody';

    return function(){

        console.log(title);

    }

}

inner = outter();

inner();

function factory_movie(title){

    return {

        get_title : function (){

            return title;

        },

        set_title : function(_title){

            title = _title

        }

    }

}

ghost = factory_movie('Ghost in the shell');

matrix = factory_movie('Matrix');

console.log(ghost.get_title());     // Ghost in the shell

console.log(matrix.get_title());    // Matrix

ghost.set_title('공각기동대');

console.log(ghost.get_title());     // 공각기동대

console.log(matrix.get_title());    // Matrix

var movies = {

    'title' : null,

    'get_title' : function (){

        return this.title;

    },

    'set_title' : function(title){

        this.title = title;

    }

}

m1 = movies;

m1.set_title("m1")

console.log(m1.get_title())

console.log(movies.get_title())

var arr = []

for(var i = 0; i < 5; i++){

    arr[i] = function(id) {

        return function(){

            return id;

        }

    }(i);

}

for(var index in arr) {

    console.log(arr[index]());

}

// arguments, 아규먼트

function sum(){

    var _sum = 0;

    for(var i = 0; i < arguments.length; i++){

        // console.log(i+' : '+arguments[i]);

        _sum += arguments[i];

    }

    return _sum;

}

console.log('result : ' + sum(1,2,3,4));

// 매개변수

function zero(){

    console.log(

        'zero.length', zero.length,

        'arguments', arguments.length

    );

}

function one(arg1){

    console.log(

        'one.length', one.length,

        'arguments', arguments.length

    );

}

function two(arg1, arg2){

    console.log(

        'two.length', two.length,

        'arguments', arguments.length

    );

    return arg1 + arg2

}

zero(); // zero.length 0 arguments 0

one('val1', 'val2');  // one.length 1 arguments 2

two('val1');  // two.length 2 arguments 1

// 함수의 호출, call function

o1 = {val1:1, val2:2, val3:3}

o2 = {v1:10, v2:50, v3:100, v4:25}

function sum2(){

    var _sum = 0;

    for(name in this){

        _sum += this[name];

    }

    return _sum;

}

console.log(sum2.apply(o1)) // 6

console.log(sum2.apply(o2)) // 185

o1.sum2 = sum2;

console.log(o1.sum2()); // sum 중간에 객체의 타입을 검사하는 과정이 필요