sort a JS string array by a specific letter

Question

I have to sort an array of strings like this:

var arr = ["akaw","waka","kawa","akwa"];

The type of sort must be by a specific letter, W in this case so my function must return this array:

arr = ["waka","kawa","akwa","akaw"];

It's a dynamic array and I don't know the number of words in array and if each words have no letter W, one W or some W.

Do you know a type of sort function to do that?

Thx!

Answer 1

Just compare the index of the letter.

arr.sort(function(a,b) {
    return a.indexOf("w") - b.indexOf("w");
})

DEMO: http://jsfiddle.net/KrqmM

waka
kawa
akwa
akaw