How to use sort function in js
This article mainly introduces how to use the sort function in js. It is very detailed and has a certain reference value. Friends who are interested must finish it!
The sort method in js is used to sort the elements of the array and return the array. The default sort order is based on the string Unicode code point.
Syntax of sort function
ArrayObject.sort (sortby)
Parameter sortby: optional. Used to specify the sort order, it must be a function.
Note: if you call this method without arguments, the elements in the array are sorted alphabetically or, more precisely, in character encoding order. To achieve this, you should first convert the elements of the array to strings (if necessary) for comparison.
The sort function is sorted alphabetically by default
Vararr1= ['axiajiajiaozhuo']
Arr.sort (); / / ['axiomagy,' baccalaureate, 'cricket,']
Vararr2= [10,5,40,25,100,1]
Arr2.sort (); / / [1, 10, 10, 100, 25, 40, 5] this ranking does not seem to get the desired results.
If you want to get the results you want, whether ascending or descending, you need to provide a comparison function. This function compares the size of the two values and then returns a number that describes the relative order of the two values.
The comparison function should have two parameters an and b, and the return values are as follows:
If an is less than b, that is, a murb is less than zero, a value less than zero is returned, and the array is arranged in ascending order.
If an equals b, 0 is returned.
If an is greater than b, that is, a murb is greater than zero, a value greater than zero is returned, and the array is arranged in descending order.
Sort by numeric size-ascending order
Arr.sort (function (a) b) {
Returna-b
})
Sort by numerical value-descending
Arr.sort (function (a) b) {
Returnb-a
})
Sort by a property value of an object in the array
Vararr= [
{name:'zopp',age:0}
{name:'gpp',age:18}
{name:'yjj',age:8}
]
Functioncompare (property) {
Returnfunction (a _ r _ b) {
Varvalue1=a [property]
Varvalue2=b [property]
Returnvalue1-value2
}
}
Console.log (arr.sort (compare ('age')
Put the array out of order
Arr.sort (function (a) b) {
ReturnMath.random ()-0.5
})
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