added Number utils...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

Number.js

@@ -0,0 +1,103 @@
+/**********************************************************************
+*
+*
+**********************************************/  /* c8 ignore next 2 */
+((typeof define)[0]=='u'?function(f){module.exports=f(require)}:define)
+(function(require){ var module={} // make module AMD/node compatible...
+/*********************************************************************/
+
+var object = require('ig-object')
+
+
+//---------------------------------------------------------------------
+
+var NumberMixin =
+module.NumberMixin =
+object.Mixin('NumberMixin', 'soft', {
+	toAlpha: function(n, alpha='abcdefghijklmnopqrstuvwxyz'){
+		var res = ''
+		var base = alpha.length
+		do{
+			res = alpha[n % base] + res
+			n = Math.floor(n/base) - 1
+		}while(n >= 0)
+		return res },
+	fromAlpha: function(str, alpha='abcdefghijklmnopqrstuvwxyz'){
+		var res = 0
+		var base = alpha.length
+		var i = 0
+		for(var c of [...str].reverse()){
+			var val = alpha.indexOf(c) + 1
+			res += val * (base ** i++) }
+		return res-1 },
+
+	toRoman: function(n){
+		var index = {
+			M: 1000,	
+				CM: 900,
+			D: 500,
+				CD: 400,
+			C: 100,		
+				XC: 90,
+			L: 50,
+				XL: 40,
+			X: 10,
+				IX: 9,
+			V: 5,		
+				IV: 4,
+			I: 1,
+		}
+		var res = ''
+		for(var R in index){
+			while(n >= index[R]){
+				res += R
+				n -= index[R] } }
+		return res },
+	fromRoman: function(str){
+		var index = {
+			M: 1000,	
+				CM: 900,
+			D: 500,
+				CD: 400,
+			C: 100,		
+				XC: 90,
+			L: 50,
+				XL: 40,
+			X: 10,
+				IX: 9,
+			V: 5,		
+				IV: 4,
+			I: 1,
+		}
+		var n = 0
+		str = str.toUpperCase()
+		while(str != ''){
+			if(str.slice(0, 2) in index){
+				n += index[str.slice(0, 2)]
+				str = str.slice(2)
+			} else if(str[0] in index){
+				n += index[str[0]]
+				str = str.slice(1)
+			} else {
+				throw new Error('fromRoman(..): Unknown sequence: '+ str) } }
+		return n },
+})
+
+NumberMixin(Number)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+var NumberProtoMixin =
+module.NumberProtoMixin =
+object.Mixin('NumberProtoMixin', 'soft', {
+	toAlpha: function(alpha='abcdefghijklmnopqrstuvwxyz'){
+		return this.constructor.toAlpha(this, alpha) },
+	toRoman: function(n){
+		return this.constructor.toRoman(this) },
+})
+
+NumberProtoMixin(Number.prototype)
+
+
+
+/**********************************************************************
+* vim:set ts=4 sw=4 nowrap :                        */ return module })

main.js

@@ -10,6 +10,7 @@
 var object = require('ig-object')
 
 // Extend built-in types...
+require('./Number')
 require('./Object')
 require('./Array')
 require('./Set')

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ig-types",
-  "version": "6.25.4",
+  "version": "6.26.0",
   "description": "Generic JavaScript types and type extensions...",
   "main": "main.js",
   "scripts": {