Sharing the method of sorting array Array.sort() in JavaScript

This article mainly introduces the sorting method of array.sort() in JavaScript. It has a very good reference value. Let’s take a look at it with the editor.

The sort() method of arrays in JavaScript is mainly used to sort the elements of the array. Among them, the sort() method has an optional parameter. However, this parameter must be a function. When calling the sort() method of an array, if no parameters are passed, the elements in the array will be sorted in alphabetical order (character encoding order). If you want to sort according to other criteria, you need to pass a parameter and it is a function. This function Compares two values ​​and returns a number describing the relative order of the two values.

1. Sort the numerical array from small to large.

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 alphabetical sorting on the string array.

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 the object, and require it to be sorted according to the age of the object. Arranged in descending order

Code:

var arr = [{'name': '张三', age: 26},{'name': '李四', age: 12},{'name': '王五', age: 37},{'name': '赵六', 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(&#39;age&#39;))
console.log(arr) // [{&#39;name&#39;: &#39;王五&#39;, age: 37},{&#39;name&#39;: &#39;张三&#39;, age: 26},{&#39;name&#39;: &#39;李四&#39;, age: 12},{&#39;name&#39;: &#39;赵六&#39;, age: 4}]

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