JSFiddle - React, Tailwind, and code Playground

by rufwork

JavaScript

var posTest = 5.1231231,
    negTest = -5.678678;

alert(posTest.toFixed(0) + " :: " +  negTest.toFixed(0));

function truncator(numToTruncate, intDecimalPlaces) {    
    var numPower = Math.pow(10, intDecimalPlaces); // "numPowerConverter" might be better
    //double tilde: http://stackoverflow.com/a/4055675/1028230
    return ~~(numToTruncate * numPower)/numPower;
}

alert(truncator(posTest, 1)
      + " :: " 
      +  truncator(negTest, 1));