add abs function

Returns the absolute value of the number as a new number.

fixes #1

README.md

@@ -15,7 +15,7 @@ npm install num
 ```javascript
 var num = require('num');
 
-var foo = int('0.1').add('0.2');
+var foo = num('0.1').add('0.2');
 
 // did it work?
 console.log(foo.toString());
@@ -24,7 +24,7 @@ console.log(foo.toString());
 
 ## api ##
 
-Besides the **num** function, all of the other methods operate on the objects returned by **int**
+Besides the **num** function, all of the other methods operate on the objects returned by **num**
 
 ### num (value) ###
 > construct a new decimal
@@ -44,10 +44,13 @@ Besides the **num** function, all of the other methods operate on the objects re
 > divide our num by {value} and return a new num
 
 ### neg ###
-> return a new int that is the negative
+> return a new num that is the negative
 
 ### abs ###
-> return a new int that is the absolute value
+> return new num that is the absolute value
+
+### abs ###
+> return a new num that is the absolute value
 
 ### cmp (value) ###
 > compare our value to {value}

num.js

@@ -123,6 +123,11 @@ Num.prototype.neg = function() {
     return new Num(this._int.neg(), this._precision);
 };
 
+/// returns new Num, absolute value of this
+Num.prototype.abs = function() {
+    return new Num(this._int.abs(), this._precision);
+};
+
 /// returns a + b
 /// a, b can each be either a Num, String, or Number
 /// will return a new Num with the greatest precision of the operands

test/abs.js

@@ -0,0 +1,12 @@
+
+var assert = require('assert');
+var num = require('../');
+
+test('abs', function() {
+    assert.equal(num(-1).abs(), '1');
+    assert.equal(num(0).sub(3).abs(), '3');
+
+    assert.equal(num(44).abs(), '44');
+    assert.equal(num(-2).abs().add(2), '4');
+});
+