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Created September 19, 2017 11:32
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https://www.freecodecamp.org/challenges/diff-two-arrays
function diffArray(arr1, arr2) {
return arr2.filter(x=>arr1.indexOf(x) == -1)
.reduce((tot,curr)=>{tot.push(curr); return tot;}
,arr1.filter(x=>arr2.indexOf(x) == -1));
}
diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]);
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