JSFiddle - React, Tailwind, and code Playground

JavaScript

var x = 0;
x = parseFloat((x + 0.4)).toFixed(1); // 0.4
x = parseFloat((x + 0.4)).toFixed(1); // 0.8
alert(x);
x = parseFloat((x + 0.4)).toFixed(1); // 1.2
alert(x);