Flatten an array

gistfile1.txt

//Write some code, that will flatten an array of arbitrarily nested arrays of //integers into a flat array of integers. e.g. [[1,2,[3]],4] -> [1,2,3,4]. 

// This solution makes use of .toString() to flatten the array, whereas if the requirements also included flattening object structures, then the typical approach of having a recursing function would be used.

var testData = {
   srcArray1 : [[1,2,[3]],4,[5]],
   srcArray2 : [[[1],2],[[3]],4],
   srcArray3 : [0,[1,1],[[2,2,2,2],[[1],[[2]],[[[3],2]]]]],
   srcArray4 : [1,[2],[[3]],[[[4]]]]
};

var outputText = "";
for (data in testData) {
   outputText += JSON.parse('['+testData[data].toString()+']')+'\n';
}

console.log(outputText);