[Javascript] Advanced Reduce: Common Mistakes

2024-02-27 13:32:38

Take away:

Always check you ruturn the accumulator
Always pass in the inital value

var data = ["vote1", "vote2", "vote1", "vote2"];

var reducer = function(acc, value){

   if(acc[value]){

     acc[value] = acc[value] + 1;

   }else{

     acc[value] = 1;

   }

  return acc;

};

var res = data.reduce(reducer ,{});

console.log(res);

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