How do I sort an array in JavaScript?

Question

In an array T we have values [b,a,d,c]. How to reorder this array in a single loop in the aim to get [a,b,c,d]?

search in SO using "javascript array sort" 3,067 results. Didn't those results pop up when you where typing your question? — KooiInc
– KooiInc, Commented May 9, 2011 at 8:05
Kooilnc: Maybe he's asking about an O(n) sorting algorithm and not a built in function to do it? At least, that's the feeling I'm getting from read the question — Soufiane Hassou
– Soufiane Hassou, Commented May 9, 2011 at 8:09
@Soufiane Hassou: turns out his question meant something quite different, as far as I understand. — KooiInc
– KooiInc, Commented May 9, 2011 at 8:35

Teneff · Accepted Answer · 2011-05-09 08:25:10Z

2

you can use the .sort() method like:

var T = new Array('a', 'd', 'c', 'b');
T.sort();

I don't really understand what do you mean by "reordering" (maybe sorting in some random order :)

however you can always use for for example:

// create new array
var U = new Array();
for (i=0; i<T.length; i++) {

    // some desired condition
    if (T[i] <= 1) {
        // put the value ( T[i] ) on the desired position
        desired_position = ???
        U[desired_position] = T[i];
    }
    else {
        // otherwise put it at the end of the array
        U.push(T[i]);
    }
}

// and here you have the "reordered" array 
alert('the array U is reordered !!');

edited May 9, 2011 at 8:25

answered May 9, 2011 at 7:59

Teneff

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4 Comments

suba Over a year ago

thanks.. but i am not asking sorting.. i just want to reorder elements for eg: {e,t,m,a} to {t,e,a,m}

KooiInc Over a year ago

@suba: than I suggest you to change your question into: How do I sort an array to a certain predefined order [in Javascript]? (and combine it with te later asked same SO question)

Teneff Over a year ago

@suba what should be the criteria for ordering ? How the function should order the array if it looks like this ['h','e','l','l','o'];

Lee Kowalkowski Over a year ago

@suba: If you're not asking about sorting, what does your question mean? Incidentally, the sort() function accepts as a parameter a reference to a function that handles the comparison between two array elements, so you can implement whatever order you can algorithmically conceive: javascriptkit.com/javatutors/arraysort.shtml

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