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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