1) 전형적인 패턴 연습
(1) 미세먼지(IDEX_MVL)의 값이 40 미만인 구 이름(MSRSTE_NM)과 값을 출력하기
서울시 미세먼지 값
```
JavaScript
let mise_list = [
{
MSRDT: "201912052100",
MSRRGN_NM: "도심권",
MSRSTE_NM: "중구",
PM10: 22,
PM25: 14,
O3: 0.018,
NO2: 0.015,
CO: 0.4,
SO2: 0.002,
IDEX_NM: "좋음",
IDEX_MVL: 31,
ARPLT_MAIN: "O3",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "도심권",
MSRSTE_NM: "종로구",
PM10: 24,
PM25: 18,
O3: 0.013,
NO2: 0.016,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 39,
ARPLT_MAIN: "PM25",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "도심권",
MSRSTE_NM: "용산구",
PM10: 0,
PM25: 15,
O3: 0.012,
NO2: 0.027,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "점검중",
IDEX_MVL: -99,
ARPLT_MAIN: "점검중",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서북권",
MSRSTE_NM: "은평구",
PM10: 36,
PM25: 14,
O3: 0.019,
NO2: 0.018,
CO: 0.5,
SO2: 0.005,
IDEX_NM: "좋음",
IDEX_MVL: 42,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서북권",
MSRSTE_NM: "서대문구",
PM10: 28,
PM25: 9,
O3: 0.018,
NO2: 0.015,
CO: 0.6,
SO2: 0.004,
IDEX_NM: "좋음",
IDEX_MVL: 37,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서북권",
MSRSTE_NM: "마포구",
PM10: 26,
PM25: 8,
O3: 0.012,
NO2: 0.021,
CO: 0.5,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 36,
ARPLT_MAIN: "NO2",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "광진구",
PM10: 17,
PM25: 9,
O3: 0.018,
NO2: 0.016,
CO: 0.6,
SO2: 0.001,
IDEX_NM: "좋음",
IDEX_MVL: 31,
ARPLT_MAIN: "O3",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "성동구",
PM10: 21,
PM25: 12,
O3: 0.018,
NO2: 0.017,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 33,
ARPLT_MAIN: "PM25",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "중랑구",
PM10: 27,
PM25: 10,
O3: 0.015,
NO2: 0.019,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 34,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "동대문구",
PM10: 26,
PM25: 9,
O3: 0.016,
NO2: 0.017,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 34,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "성북구",
PM10: 27,
PM25: 8,
O3: 0.022,
NO2: 0.014,
CO: 0.5,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 37,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "도봉구",
PM10: 25,
PM25: 12,
O3: 0.024,
NO2: 0.011,
CO: 0.3,
SO2: 0.002,
IDEX_NM: "좋음",
IDEX_MVL: 41,
ARPLT_MAIN: "O3",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "강북구",
PM10: 30,
PM25: 15,
O3: 0.022,
NO2: 0.02,
CO: 0.4,
SO2: 0.002,
IDEX_NM: "좋음",
IDEX_MVL: 39,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동북권",
MSRSTE_NM: "노원구",
PM10: 21,
PM25: 14,
O3: 0.017,
NO2: 0.016,
CO: 0.4,
SO2: 0.004,
IDEX_NM: "좋음",
IDEX_MVL: 36,
ARPLT_MAIN: "PM25",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "강서구",
PM10: 36,
PM25: 16,
O3: 0.021,
NO2: 0.013,
CO: 0.4,
SO2: 0.004,
IDEX_NM: "좋음",
IDEX_MVL: 42,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "구로구",
PM10: 23,
PM25: 10,
O3: 0.022,
NO2: 0.016,
CO: 0.3,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 37,
ARPLT_MAIN: "O3",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "영등포구",
PM10: 29,
PM25: 15,
O3: 0.01,
NO2: 0.022,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 41,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "동작구",
PM10: 29,
PM25: 15,
O3: 0.012,
NO2: 0.023,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 41,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "관악구",
PM10: 27,
PM25: 12,
O3: 0.012,
NO2: 0.022,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 37,
ARPLT_MAIN: "NO2",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "금천구",
PM10: 25,
PM25: 15,
O3: 0.015,
NO2: 0.02,
CO: 0.4,
SO2: 0.004,
IDEX_NM: "좋음",
IDEX_MVL: 43,
ARPLT_MAIN: "PM25",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "서남권",
MSRSTE_NM: "양천구",
PM10: 0,
PM25: 14,
O3: 0.016,
NO2: 0.017,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "점검중",
IDEX_MVL: -99,
ARPLT_MAIN: "점검중",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동남권",
MSRSTE_NM: "강남구",
PM10: 31,
PM25: 16,
O3: 0.018,
NO2: 0.018,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 39,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동남권",
MSRSTE_NM: "서초구",
PM10: 34,
PM25: 13,
O3: 0.024,
NO2: 0.019,
CO: 0.3,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 41,
ARPLT_MAIN: "PM10",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동남권",
MSRSTE_NM: "송파구",
PM10: 25,
PM25: 6,
O3: 0.014,
NO2: 0.025,
CO: 0.4,
SO2: 0.003,
IDEX_NM: "좋음",
IDEX_MVL: 42,
ARPLT_MAIN: "NO2",
},
{
MSRDT: "201912052100",
MSRRGN_NM: "동남권",
MSRSTE_NM: "강동구",
PM10: 24,
PM25: 14,
O3: 0.016,
NO2: 0.02,
CO: 0.4,
SO2: 0.002,
IDEX_NM: "좋음",
IDEX_MVL: 39,
ARPLT_MAIN: "PM25",
},
];
```
```
JavaScript
for (let i = 0; i < mist_list.length; i++){
let mise = mise_list[i];
if (mise["IDEX_MVL"] < 40) {
let gu_name = mise["MSRSTE_NM"];
let gu_mise = mise["IDEX_MVL"];
console.log("40보다 작은 구: " + gu_name + ", " + gu_mise);
}
}
```
40 이하든, 35 이하든 유용하게 쓸 수 있게, 함수로 만들어볼까?
```
JavaScript
function show_gus(index){
for (let i = 0; i < mise_list.length; i++){
let mise = mise_list[i];
if (mise["IDEX_MVL"] < index) {
let gu_name = mise["MSRSTE_NM"]'
let gu_mise = mise["IDEX_MVL"];
console.log(gu_name, gu_mise);
}
}
}
// 이러면 아래와 같은 것이 가능!
show_gus(40) // 40보다 작은 구만 출력!
show_gus(35) // 35보다 작은 구만 출력!
```
즐기는 사람이 이긴다