JavaScript adding decimal numbers issue [duplicate]

Answer 1

This is common issue with floating points.

Use toFixed in combination with parseFloat.

Here is example in JavaScript:

function roundNumber(number, decimals) {
    var newnumber = new Number(number+'').toFixed(parseInt(decimals));
    return parseFloat(newnumber); 
}

0.1 + 0.2;                    //=> 0.30000000000000004
roundNumber( 0.1 + 0.2, 12 ); //=> 0.3