Fixing Spymaster's formatNumber()

formatNumber.js

// How to format big numbers using commas to separate 1000s and abbreviations
// Example: 12345678900 => 12.34B

var numPattern = /^(\d{0,2})(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?(\d{3})?$/;
function putCommasIn(s){
	return s.match(numPattern).slice(1).join(",").replace(/^\,{1,}/, "").replace(/\,{1,}$/, "");
}

function trimZeroes(s){
	return s.replace(/\.?0+$/, "");
}

var exp = [0, 0, 0, 0, 3, 3, 6, 6, 6, 9, 9, 9, 12];
var abbr = "***K**M**B**T";

// logically we use floor() instead of round() to truncate a number (Spymaster-specific)

function formatNumber(n, decimals){
	if(isNaN(n)){
		return "";
	}
	if(typeof decimals != "number"){
		decimals = 2;
	}
	if(n <= 1){
		var t1 = n.toString(), t2 = n.toFixed(decimals);
		return t1.length < t2.length ? t1 : t2;
	}
	var digits = Math.floor(Math.log(n) / Math.LN10);
	if(digits >= exp.length){
		digits = exp.length - 1;
	}
	var e = exp[digits];
	var s = Math.floor(n / Math.pow(10, e - decimals)).toFixed(0);
	return trimZeroes(putCommasIn(s.slice(0, -decimals)) + "." + s.slice(-decimals)) + (e && abbr.charAt(e) || "");
}