[Solved] how can I get a JSON like this with javascript [closed]

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Loop over the rows. Keep the province as key. Before adding do a check if the key is already present. If already present add to array.Something like this,

if(obj[key]){
  obj[key].push(city);
}else{
  obj[key] = [];
  obj[key].push(city);
}

3

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solved how can I get a JSON like this with javascript [closed]