Share Array. sort () sorting methods in JavaScript

This article describes how to sort arrays. sort () in JavaScript. It has good reference value. Let's take a look at it below. This article mainly introduces the sorting method of Array. sort () in JavaScript. It has good reference value. Let's take a look at it together with the small Editor.

The sort () method of arrays in JavaScript is mainly used to sort the elements of arrays. The sort () method has an optional parameter. However, this parameter must be a function. When an array calls the sort () method, if it is not passed, it sorts the elements in the array in alphabetical order (character encoding order). If you want to sort the elements according to other criteria, you need to pass a parameter and it is a function. This function must compare two values and return a number indicating the relative sequence of the two values.

1. Sort the number array in ascending order.

Code:

var arr = [22,12,3,43,56,47,4];arr.sort();console.log(arr); // [12, 22, 3, 4, 43, 47, 56]arr.sort(function (m, n) { if (m < n) return -1 else if (m > n) return 1 else return 0});console.log(arr); // [3, 4, 12, 22, 43, 47, 56]

2. Perform case-insensitive alphabetic sorting on string arrays.

Code:

var arr = ['abc', 'Def', 'BoC', 'FED'];console.log(arr.sort()); // ["BoC", "Def", "FED", "abc"]console.log(arr.sort(function(s, t){ var a = s.toLowerCase(); var b = t.toLowerCase(); if (a < b) return -1; if (a > b) return 1; return 0;})); // ["abc", "BoC", "Def", "FED"]

3. Sort the array containing objects in the ascending order of age.

Code:

Var arr = [{'name': 'zhang san', age: 26}, {'name': 'Li si', age: 12}, {'name ': 'wang 5', age: 37}, {'name': 'zhao liu', age: 4}]; var objectArraySort = function (keyName) {return function (objectN, objectM) {var valueN = objectN [keyName] var valueM = objectM [keyName] if (valueN <valueM) return 1 else if (valueN> valueM) return-1 else return 0} arr. sort (objectArraySort ('age') console. log (arr) // [{'name': 'wang 5', age: 37}, {'name': 'zhang san', age: 26 },{ 'name ': 'lily', age: 12}, {'name': 'zhao liu', age: 4}]

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