Printf-as is a third-party library that will handle this. Here is the GitHub repo. From the README:
printf("You can also display numbers like PI: %f, and format them to a fixed precision,
such as PI with 3 decimal places %.3f", Math.PI, Math.PI);
// outputs: " You can also display numbers like PI: 3.141592653589793,
// and format them to a fixed precision, such as PI with 3 decimal places 3.142"
It also plays well with dates:
var date : Date = new Date();
printf("Today is %d/%m/%Y", date, date, date);
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