Fix index out-of-bounds behavior

Author: kgryte

lib/node_modules/@stdlib/repl/presentation/lib/main.js

@@ -239,30 +239,34 @@ inherit( Presentation, EventEmitter );
 * @returns {(Object|null)} selected slide
 */
 setNonEnumerableReadOnly( Presentation.prototype, '_select', function select( n, fragment ) {
+	var sc;
+	var fc;
 	var N;
 
 	// Limit the slide cursor range to one position before/after the first/last slide in order to avoid multiple previous/next calls moving the cursors indefinitely away from the slide deck...
 	N = this.length;
-	this._slideCursor = clamp( n, -1, N );
-	if ( this._slideCursor === -1 || this._slideCursor === N ) {
+	sc = clamp( n, -1, N );
+	if ( sc === -1 || sc === N ) {
 		debug( 'Unable to select slide. Slide cursor out-of-range.' );
 		this._slide = null;
 	} else {
-		this._slide = this._slides[ this._slideCursor ];
+		this._slide = this._slides[ sc ];
 	}
 	if ( this._slide && arguments.length > 1 ) {
 		// Limit the slide fragment cursor range:
 		N = this._slide.fragments.length;
-		this._fragmentCursor = clamp( fragment, -1, N );
-		if ( this._fragmentCursor === -1 || this._fragmentCursor === N ) {
+		fc = clamp( fragment, -1, N );
+		if ( fc === -1 || fc === N ) {
 			debug( 'Unable to select slide fragment. Fragment cursor out-of-range.' );
 			this._slide = null;
 		}
 	} else {
-		this._fragmentCursor = 0;
+		fc = 0;
 	}
 	if ( this._slide ) {
-		debug( 'Selected slide %d and fragment %d.', this._slideCursor, this._fragmentCursor );
+		debug( 'Selected slide %d and fragment %d.', sc, fc );
+		this._slideCursor = sc;
+		this._fragmentCursor = fc;
 	}
 	return this._slide;
 });