JSFiddle - React, Tailwind, and code Playground

JavaScript

var results = [];

for (var i = 0; i < 1000; ++i) {
    results.push(Math.pow(Math.random() - 0.5, 3) * 4 + 0.5);
}

var r = results.reduce(function(result, value) {
    var key = Math.floor(value * 10);
    if (!result[key]) {
        result[key] = 0;
    }
    result[key]++;
    return result;
}, {});

console.log(r);