Add currency number list function (#11)

* Fix failing assertion for countries count (245 -> 246)

* Add numbers() function

* Document numbers() in readme

* Handle undefined currency numbers (e.g. for XFU and XBT)

* Revert to single quotes

* Update .gitignore

README.md

@@ -84,6 +84,23 @@ console.log(cc.codes());
 */
 ```
 
+## numbers()
+
+``` js
+var cc = require('currency-codes');
+console.log(cc.numbers());
+
+/*
+[
+	'784',
+	'971',
+	...
+	'710',
+	'967'
+]
+*/
+```
+
 ## countries()
 
 ``` js

index.js

@@ -3,40 +3,55 @@ var nub = require('nub');
 var data = require('./data');
 
 var code = function(code) {
-	code = code.toUpperCase();
+  code = code.toUpperCase();
 
-	return first(data, function(c) {
-		return c.code === code;
-	});
+  return first(data, function(c) {
+    return c.code === code;
+  });
 };
 var country = function(country) {
-	country = country.toLowerCase();
+  country = country.toLowerCase();
 
-	return data.filter(function(c) {
-		return (c.countries || []).indexOf(country) > -1;
-	});
+  return data.filter(function(c) {
+    return (c.countries || []).indexOf(country) > -1;
+  });
 };
 var number = function(number) {
-	return first(data, function(c) {
-		return c.number === String(number);
-	});
+  return first(data, function(c) {
+    return c.number === String(number);
+  });
 };
 var codes = function() {
-	return data.map(function(c) {
-		return c.code;
-	});
+  return data.map(function(c) {
+    return c.code;
+  });
+};
+var numbers = function() {
+  var items = data.map(function(c) {
+    return c.number;
+  });
+
+  // handle cases where number is undefined (e.g. XFU and XBT)
+  return items.filter(function(n) {
+    if (n) {
+      return n;
+    }
+  });
 };
 var countries = function() {
-	var m = data.filter(function(c) {
-		return c.countries;
-	}).map(function(c) {
-		return c.countries;
-	});
-	return nub(Array.prototype.concat.apply([], m));
+  var m = data
+    .filter(function(c) {
+      return c.countries;
+    })
+    .map(function(c) {
+      return c.countries;
+    });
+  return nub(Array.prototype.concat.apply([], m));
 };
 
 exports.code = code;
 exports.country = country;
 exports.number = number;
 exports.codes = codes;
+exports.numbers = numbers;
 exports.countries = countries;

test.js

@@ -6,4 +6,6 @@ assert(cc.number('967').currency === 'Zambian kwacha');
 assert(cc.number(967).currency === 'Zambian kwacha');
 assert(cc.country('colombia').length === 2);
 assert(cc.codes().length === 179);
-assert(cc.countries().length === 245);
+assert(cc.countries().length === 246);
+assert(cc.numbers().length === 177);
+assert(cc.numbers()[0] === '784');