680
629

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?

More than 5 years have passed since last update.

JavaScript つい忘れてしまう配列のソート方法

Last updated at Posted at 2015-06-15

いつも忘れてググルので、ここにメモしておきます。

#1次元配列のソート
##昇順ソート

var a = [5,3,9,1,10]
a.sort(function(a,b){
    	if( a < b ) return -1;
        if( a > b ) return 1;
        return 0;
});
結果:1,3,5,9,10

##降順ソート

var a = [5,3,9,1,10]
a.sort(function(a,b){
    	if( a > b ) return -1;
        if( a < b ) return 1;
        return 0;
});
結果:10,9,5,3,1

#連想配列の特定のキーでソート
##昇順

//フルーツの名前と価格。価格でソートする
var fruits = [
   {name:"apple",price:100},
   {name:"orange",price:98},
   {name:"banana",price:50},
   {name:"melon",price:500},
   {name:"mango",price:398}
]

fruits.sort(function(a,b){
    if(a.price<b.price) return -1;
    if(a.price > b.price) return 1;
    return 0;
});
console.log(fruits)

結果
[ { name: 'banana', price: 50 },
  { name: 'orange', price: 98 },
  { name: 'apple', price: 100 },
  { name: 'mango', price: 398 },
  { name: 'melon', price: 500 } ]

##降順

fruits.sort(function(a,b){
    if(a.price>b.price) return -1;
    if(a.price < b.price) return 1;
    return 0;
});
console.log(fruits);
結果
[ { name: 'melon', price: 500 },
  { name: 'mango', price: 398 },
  { name: 'apple', price: 100 },
  { name: 'orange', price: 98 },
  { name: 'banana', price: 50 } ]

#連想配列の複数のキーでソート

//フルーツの価格と重さ。
var fruits = [
   {name:"apple",price:100,weight:90},
   {name:"mango",price:500,weight:200},  
   {name:"orange",price:98,weight:150},
   {name:"apple",price:100,weight:100}, 
   {name:"banana",price:50,weight:50},
   {name:"melon",price:500,weight:500},
   {name:"mango",price:398,weight:200}
]

//重さ、価格、の順に並び替え(降順)

fruits.sort(function(a,b){
    if(a.weight>b.weight) return -1;
    if(a.weight<b.weight) return 1;
    if(a.price>b.price) return -1;
    if(a.price < b.price) return 1;
    return 0;
});

結果
[ { name: 'melon', price: 500, weight: 500 },
  { name: 'mango', price: 500, weight: 200 },
  { name: 'mango', price: 398, weight: 200 },
  { name: 'orange', price: 98, weight: 150 },
  { name: 'apple', price: 100, weight: 100 },
  { name: 'apple', price: 100, weight: 90 },
  { name: 'banana', price: 50, weight: 50 } ]

これであってるよね?
間違いがありましたら、ご指摘ください。

#関連リンク
あれ?昇順てどっちだっけ?降順てどっちだっけ?

680
629
9

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
680
629

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?