Number format perf test for Node.js

perf-nf.js

var process = require('process');

function delta(d) {
    return d[0] + (d[1]/1e9);
}

var n = 0.1; // specific # affects speed 
var nn = [];
var nf;
if(process.versions.icu) { // this was added in https://github.com/nodejs/node/issues/3089
    // options affect speed
    nf = new Intl.NumberFormat([], {minDecimalPlaces: 2});
} else {
    nf = {
        format: function(nnn) { return nnn.toLocaleString(); }
    };
}
var p0 = process.hrtime();
for(var k=0;k<10000;k++) { /*n.toString();*/ nf.format(n); }
var p1 = process.hrtime(p0);
console.log((process.versions.icu||'none') + "	 : " + delta(p1) + " : " + nf.format(n));