Notes 
JS: which for
If you want to iterate by array than use
for (var i=0;i<data.length;i++) {
do_smth_with(data[i])
}
NOT
for (var i in data) {
do_smth_with(data[i])
}
Use this to iterate by objects only.
If you want to iterate by array than use
for (var i=0;i<data.length;i++) {
do_smth_with(data[i])
}
NOT
for (var i in data) {
do_smth_with(data[i])
}
Use this to iterate by objects only.
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