JavaScript Массив sort()

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Examples

// Создаем массив
const fruits = ["Банан", "Апельсин", "Яблоко", "Манго"];

// Сортируем массив
fruits.sort();

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More Examples Below !

Description

The sort() method sorts the elements of an array.

The sort() method sorts the elements as strings in alphabetical and ascending order.

The sort() method overwrites the original array.

Sort Compare Function

Sorting alphabetically works well for strings ("Яблоко" comes before "Банан").

But, sorting numbers can produce incorrect results.

"25" is bigger than "100", because "2" is bigger than "1".

You can fix this by providing a "compare function" (See examples below).

Syntax

array.sort(compareFunction)

Parameters

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).

Return Value

Type	Description
Array	The array with the items sorted.

More Examples

Sort Decending

Sort and then reverse the order:

// Создаем массив
const fruits = ["Банан", "Апельсин", "Яблоко", "Манго"];

// Сортируем массив
fruits.sort();

// Переворачиваем массив
fruits.reverse();

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Numeric Sorts

Using a Sort Function

Sort numbers in ascending order:

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

// Сортируем массив
points.sort(function(a, b){return a-b});

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Sort numbers in descending order:

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

// Сортируем массив
points.sort(function(a, b){return b-a});

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Find the lowest value:

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

// Сортируем числа в порядке возрастания
points.sort(function(a, b){return a-b});

let lowest = points[0];

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Find the highest value:

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

// Сортируем числа по убыванию:
points.sort(function(a, b){return b-a});

let highest = points[0];

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Find the highest value:

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

// Сортируем числа по возрастанию:
points.sort(function(a, b){return a-b});

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

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