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JavaScript配列sort()

配列の並べ替え:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();

並べ替えてから順序を逆にします。

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();
fruits.reverse();

定義と使用法

配列のsort()要素を並べ替えます。

元のsort()配列を上書きします。

sort()、要素を文字列としてアルファベット順および昇順で並べ替えます。

関連項目:

配列reverse()メソッド

ソート比較機能

文字列のアルファベット順の並べ替えはうまく機能します(「Apple」は「Banana」の前にあります)。

ただし、数値を並べ替えると、誤った結果が生成される可能性があります。

「2」は「1」よりも大きいため、「25」は「100」よりも大きくなります。

これは、「比較機能」を提供することで修正できます(以下の例を参照)。


構文

array.sort(compareFunction)

パラメーター

Parameter Description
compareFunction Optional.
A function that defines a sort order. The function should return a negative, zero, or positive value, depending on the arguments:
  • function(a, b){return a-b}

When sort() compares two values, it sends the values to the compare function, and sorts the values according to the returned (negative, zero, positive) value.

Example:

The sort function will sort 40 as a value lower than 100.

When comparing 40 and 100, sort() calls the function(40,100).

The function calculates 40-100, and returns -60 (a negative value).

戻り値

アイテムがソートされた配列。


その他の例

番号を昇順で並べ替えます。

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

番号を降順で並べ替えます。

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

最小値を見つけます:

const points = [40, 100, 1, 5, 25, 10];

// Sort the numbers in ascending order
points.sort(function(a, b){return a-b});

let lowest = points[0];

最高値を見つける:

const points = [40, 100, 1, 5, 25, 10];

// Sort the numbers in descending order:
points.sort(function(a, b){return b-a});

let lowest = points[0];

最高値を見つける:

const points = [40, 100, 1, 5, 25, 10];

// Sort the numbers in ascending order:
points.sort(function(a, b){return a-b});

let highest = points[points.length-1];

ブラウザのサポート

sort() ECMAScript1(ES1)機能です。

ES1(JavaScript 1997)は、すべてのブラウザーで完全にサポートされています。

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