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?
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2What did you try already? there are a tons of questions like this one anyway! :Pbriosheje– briosheje2015-04-01 08:33:43 +00:00Commented Apr 1, 2015 at 8:33
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@briosheje I do not do kind of the sort before. I have no idea. :(Bubble– Bubble2015-04-01 08:35:47 +00:00Commented Apr 1, 2015 at 8:35
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You can either use .sort, .filter or .map, your choice! :Pbriosheje– briosheje2015-04-01 08:37:08 +00:00Commented Apr 1, 2015 at 8:37
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Do you have a JSON string with that content? Otherwise it's just an array of objects, and there is no JSON involved at all.Guffa– Guffa2015-04-01 08:44:47 +00:00Commented Apr 1, 2015 at 8:44
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4 Answers
A sort function (literal) returns 1, -1, 0 for ascending, descending and equal respectively.
array.sort(function(a, b) {
return a.num - b.num
});
Comments
the_array.sort(function(a,b) { return a.num-b.num } );
where the function inside the sort() is the comparator
Comments
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.
1 Comment
nicael
I changed
console.log to document.write and also added JSON.stringify() so as to make your snippet more useful :)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.
4 Comments
Mike
@nicael Actually, there are no answers while I'm editing this post.
nicael
There are three answers which were posted before yours and the are completely identical. Yours is, believe me, excess.
Mike M
I think the answers should be based on their correctness rather than whether they are identical to others.
Mike
@nicael In this question, you should not only focus on the answer, as you know it's quite simple but what a JavaScript programmer should know is the theory behind the answer, that's why I mention the two points in my answer and actually not excess.