Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr= ["0", "2", "8", "8", "8", "8", "8", "8", "2", "9", "9", "9", "9", "9", "2", "10", "10", "10", "10", "10", "10", "10", "10", "0", "3", "11", "11"];
    
    var newObj = {}
    
    for(var i = 0; i < arr.length; i++){
        newObj[arr[i]] = ++newObj[arr[i]] || 1;
    }
    
    console.log(newObj)

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JSFiddle - React, Tailwind, and code Playground

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