Sort the json in the array

Question

I want to sort the Array, according to the property such as this:

[
{num:5},{num:3},{num:6},{num:9}
] 

After the sort, I want to get

[
{num:3},{num:5},{num:6},{num:9}
] 

How to do it in JavaScript?

Answer 1

A sort function (literal) returns 1, -1, 0 for ascending, descending and equal respectively.

array.sort(function(a, b) {
      return a.num - b.num
});

Answer 2

the_array.sort(function(a,b) { return a.num-b.num } );

其中sort（）中的函数是比较器

Answer 3

 var arr = [ {num:5},{num:3},{num:6},{num:9} ]; arr.sort(function(a,b) { return a.num-b.num; }); document.write(JSON.stringify(arr)); 

If you would need to sort items backwards it would be b.num-a.num .

Answer 4

In this case, you should learn to use lambda expression witch is the key of functional programming. The answer is quite easy:

arr.sort(function(a,b){
     return a.num - b.num;
})

If you don't know the high order function or lambda you are not actually writing JavaScript code.