js陣列排序整理

(1) 數值排序 | 上升 [⇣⁰₉]

const arr = [40, 100, 1, 5, 25, 10];
arr.sort(function(a, b){
  return a-b;
});

之前：[40,100,1,5,25,10]

之後：[1,5,10,25,40,100]

(2) 數值排序 | 降序[⇣⁹₀]

const arr = [40, 100, 1, 5, 25, 10];
arr.sort(function(a, b){
  return b-a; 
});

之前：[40,100,1,5,25,10]

之後：[100,40,25,10,5,1]

(3) 字母排序 | 上升✷ [⇣ᴬᴢ]

const arr = ["Blue", "Orange", "Aqua", "Marine"];
arr.sort()

之前：["Blue", "Orange", "Aqua", "Marine"]

之後：['Aqua', 'Blue', 'Marine', 'Orange']

(4) 字母排序 | 降序✷ [⇣ᶻᴀ]

const arr = ["Blue", "Orange", "Aqua", "Marine"];
arr.sort().reverse();

之前：["Blue", "Orange", "Aqua", "Marine"]

之後：['Orange', 'Marine', 'Blue', 'Aqua']

(5) 日期排序 | 上升 [▲]

const arr = ["2015-03-25", "2015-02-01", "2015-01-03", "2015-02-02"];
arr.sort(function(a, b){
    return new Date(a)-new Date(b);
});

之前：[“2015-03-25”、”2015-02-01”、”2015-01-03”、”2015-02-02”]

之後：[“2015–01–03”、”2015–02–01”、”2015–02–02”、”2015–03–25”]

(6) 日期排序 | 降序 [▼]

const arr = ["2015-03-25", "2015-02-01", "2015-01-03", "2015-02-02"];
arr.sort(function(a, b){
    return new Date(b)-new Date(a); 
});

之前：[“2015-03-25”、”2015-02-01”、”2015-01-03”、”2015-02-02”]

之後：[“2015–03–25”、”2015–02–02”、”2015–02–01”、”2015–01–03”]