Javascript calculates repeated values ​​​​in a two-dimensional array sample code

Preface

I recently encountered a problem at work. The requirement is to use Javascript to calculate repeated values ​​​​of a two-dimensional array. For example, there is a two-dimensional array below

[[\'error\',3],[\'error\',5],[\'error\',6],[\'true\',3],[\'true\',1]]

Need Statistical calculation of duplicate items \'error\' and \'true\',

Result after statistical calculation:

[[\'error\',14],[\'true\',4]]

Implementation code:

var arr = [[\'error\',3],[\'error\',5],[\'error\',6],[\'true\',3],[\'true\',1]];
var obj = {};
var result = [];
arr.forEach(function(arr){
 obj[arr[0]] = obj[arr[0]]? obj[arr[0]] + arr[1] : arr[1];
});
for (var i in obj){
 result.push([i,obj[i]])
}

Summary

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