Flat an array of arrays

array-flatten.js

var inArr = [[[1, 2],],[3],[[4, 5],[6]]];
var result = [];
function flattenArray(arr) {
    for (var i = 0; i < arr.length; i++) {
        if (Array.isArray(arr[i]))
            flattenArray(arr[i]);
        else
            result.push(arr[i]);
    }
    return result;
}
alert(flattenArray(inArr));