[FIX] negative indices.

README.md

@@ -46,7 +46,7 @@ Notes about the notation:
 
 ``` javascript
 var arr = indexspace( '[:-2]', 5 );
-// returns [ 0, 1 ]
+// returns [ 0, 1, 2 ]
 ```
 
 The function also recognizes the `end` keyword, which refers to the last index; i.e., `len-1`. If specified as the `stop` index, `end` is inclusive.
@@ -108,7 +108,7 @@ arr =  indexspace( '[:10:3]', 20 );
 // returns [ 0, 3, 6, 9 ]
 
 arr = indexspace( '[:-2]', 5 );
-// returns [ 0, 1 ]
+// returns [ 0, 1, 2 ]
 
 arr = indexspace( '[:-1:2]', 5 );
 // returns [ 0, 2 ]
@@ -117,7 +117,7 @@ arr = indexspace( '[-4:-1:2]', 5 );
 // returns [ 0, 2 ]
 
 arr = indexspace( '[-5:-1]', 5 );
-// returns [ 0, 1, 2 ]
+// returns [ 0, 1, 2, 3 ]
 
 arr = indexspace( '[::-1]', 5 );
 // returns [ 4, 3, 2, 1, 0 ]

examples/index.js

@@ -40,7 +40,7 @@ console.log( arr );
 arr = indexspace( '[:-2]', 5 );
 console.log( '\n[:-2]' );
 console.log( arr );
-// returns [ 0, 1 ]
+// returns [ 0, 1, 2 ]
 
 arr = indexspace( '[:-1:2]', 5 );
 console.log( '\n[:-1:2]' );
@@ -55,7 +55,7 @@ console.log( arr );
 arr = indexspace( '[-5:-1]', 5 );
 console.log( '\n[-5:-1]' );
 console.log( arr );
-// returns [ 0, 1, 2 ]
+// returns [ 0, 1, 2, 3 ]
 
 arr = indexspace( '[::-1]', 5 );
 console.log( '\n[::-1]' );

lib/index.js

@@ -219,7 +219,7 @@ function indexspace( str, len ) {
 		}
 		// Handle negative index...
 		else if ( x2 < 0 ) {
-			x2 = len - 2 + x2; // len-1-x2 = (end)-x2
+			x2 = len - 1 + x2; // len-1-x2 = (end)-x2
 			if ( x2 < 0 ) {
 				// WARNING: forgive the user for exceeding index bounds...
 				x2 = 0;

test/test.js

@@ -119,11 +119,11 @@ describe( 'compute-indexspace', function tests() {
 		assert.deepEqual( actual, expected, '[2::2]' );
 
 		actual = indexspace( '[:-1]', 5 );
-		expected = [ 0, 1, 2 ];
+		expected = [ 0, 1, 2, 3 ];
 		assert.deepEqual( actual, expected, '[:-1]' );
 
 		actual = indexspace( '[:-2]', 5 );
-		expected = [ 0, 1 ];
+		expected = [ 0, 1, 2 ];
 		assert.deepEqual( actual, expected, '[:-2]' );
 
 		actual = indexspace( '[:-1:2]', 5 );
@@ -135,7 +135,7 @@ describe( 'compute-indexspace', function tests() {
 		assert.deepEqual( actual, expected, '[-4:-1:2]' );
 
 		actual = indexspace( '[-5:-1]', 5 );
-		expected = [ 0, 1, 2 ];
+		expected = [ 0, 1, 2, 3 ];
 		assert.deepEqual( actual, expected, '[-5:-1]' );
 
 		actual = indexspace( '[::-1]', 5 );