JSFiddle - React, Tailwind, and code Playground

JavaScript

myArr = [["venue", 2], ["venue", 16], ["inning", 2], ["inning", 4], ["inning", 32], ["hithard", 4]]

var final = {};
for (var i = 0; i < myArr.length; i++) {
    final[myArr[i][0]] = (final[myArr[i][0]] || 0) + myArr[i][1];
}

console.log(final);