Javascript calculation of duplicate values ​​for two-dimensional arrays

Preface

I encountered a problem in my work recently. The requirement is to use Javascript to calculate the duplicate values ​​of a two-dimensional array, such as a two-dimensional array below.

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

The duplicates \'error\' and \'true\' need to be counted statistically,

Results 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 = [];
(function(arr){
 obj[arr[0]] = obj[arr[0]]? obj[arr[0]] + arr[1] : arr[1];
});
for (var i in obj){
 ([i,obj[i]])
}

Summarize

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