Demo showing the use of maximumFractionDigits
The numbers are rounded, as there can only be a max of one fraction digit.
by David Storey
JavaScript
var mxFr1 = new Intl.NumberFormat("en", { maximumFractionDigits: 1});
console.log(mxFr1.format(.42)); // 0.4
console.log(mxFr1.format(.99)); // 1