Only fire a change event when provided a new value

Author: kgryte

lib/node_modules/@stdlib/plot/components/svg/rug/lib/props/scale/set.js

@@ -20,12 +20,14 @@ function set( fcn ) {
 	if ( !isFunction( fcn ) ) {
 		throw new TypeError( 'invalid value. `scale` must be a function. Value: `' + fcn + '.`' );
 	}
-	debug( 'Current value: %s.', this._scale );
+	if ( fcn !== this._scale ) {
+		debug( 'Current value: %s.', this._scale );
 
-	this._scale = fcn;
-	debug( 'New Value: %s.', this._scale );
+		this._scale = fcn;
+		debug( 'New Value: %s.', this._scale );
 
-	this.emit( 'change' );
+		this.emit( 'change' );
+	}
 } // end FUNCTION set()