[Node.js]Map, Set 등

var map1 = new Map();

map1.set('name', 'www20kr');

map1.set('date', new Date('2014-10-17'));

map1.get('name'); //'www20kr'

map1.get('date'); //Fri Oct 17 20014 09:00:00 GMT+0922 (KST);

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var map1 = new Map();

var obj = {name : 'www20kr'};

map1.set(obj, 'Congrat');

map1.get(obj); //Congrat

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var set1 =  new Set();

set1.add(1);

set1.add(2);

set1.add(2);

set1.size; //2

set1.has(2); // true

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var t = (x) => x * x;

t(4);//16

t(8);//64

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*같은 함수의 코딩 방식 차이

db.find(id, function(err, data)

{

return data;

}

//es6

db.find(id, (err, data) => data);

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var custom = new Custom();

custom.on('event1', function()

{

console.log('event1====');

}

custom.emit('evetn1);

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