JSFiddle - React, Tailwind, and code Playground

JavaScript

var array = ["car", "plane", "plane", "car", "car"];

var arrayMap = {};
for (var i = 0; i < array.length; i++) {
    if (arrayMap.hasOwnProperty(array[i])) {
        arrayMap[array[i]]++;
    } else {
        arrayMap[array[i]] = 1;
    }
}

console.log(arrayMap);