I needed to write a quick function to compare two arrays and report
the differences(index matters), in my case the old order of a sortable
container to the new order onUpdate. May come in handy for the next
guy..
mya1 = ['1','2','3','4','5'];
mya2 = ['1','2','3','40','5'];
mya3 = ['1','20','3','4','50'];
function findDelta(a1,a2){
return a1.inject([], function(array, value, index) {
if (value != a2[index])
array.push({value:value, index:index, delta:a2[index]});
return array;
})
}
findDelta(mya1,mya2).toJSON();
//returns [{"value": "4", "index": 3, "delta": "40"}]
findDelta(mya1,mya3).toJSON();
//returns [{"value": "2", "index": 1, "delta": "20"}, {"value": "5",
"index": 4, "delta": "50"}]
findDelta(mya2,mya3).toJSON();
//returns [{"value": "2", "index": 1, "delta": "20"}, {"value": "40",
"index": 3, "delta": "4"}, {"value": "5", "index": 4, "delta": "50"}]
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