From ab470a9450359a742f3668fcacdaee5fe38f7eee Mon Sep 17 00:00:00 2001
From: "Alex A. Naanou" <alex.nanou@gmail.com>
Date: Tue, 8 Jun 2021 16:44:51 +0300
Subject: [PATCH] added <set>.replace(..)...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
---
 README.md    | 12 ++++++++++++
 Set.js       | 12 ++++++++++++
 package.json |  2 +-
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 59494e7..f05aadd 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ Library of JavaScript type extensions, types and utilities.
   - [`Map`](#map)
     - [`<map>.sort(..)`](#mapsort)
   - [`Set`](#set)
+    - [`<set>.replace(..)`](#setreplace)
     - [`<set>.unite(..)`](#setunite)
     - [`<set>.intersect(..)`](#setintersect)
     - [`<set>.subtract(..)`](#setsubtract)
@@ -887,6 +888,17 @@ require('ig-types/Set')
 ```
 
 
+### `<set>.replace(..)`
+
+Replace value in set with other value retaining item order
+```bnf
+<set>.replace(<old>, <new>)
+    -> <union-set>
+```
+
+Note that this might not be cheap for very large sets.
+
+
 ### `<set>.unite(..)`
 
 Unite two sets and return the resulting set
diff --git a/Set.js b/Set.js
index 7b27545..cd7fa84 100644
--- a/Set.js
+++ b/Set.js
@@ -45,6 +45,18 @@ object.Mixin('SetMixin', 'soft', {
 					del(e)
 					add(e) } }.bind(this))
 		return this },
+
+	replace: function(old, value){
+		// nothing to do...
+		if(!this.has(old) || old === value){
+			return this }
+		var order = [...this]
+		// XXX is this fast enough???
+		order[order.lastIndexOf(old)] = value
+		this.delete(old)
+		this.add(value)
+		this.sort(order)
+		return this },
 })
 
 
diff --git a/package.json b/package.json
index 44f5489..09eecbf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-types",
-  "version": "6.4.0",
+  "version": "6.5.0",
   "description": "Generic JavaScript types and type extensions...",
   "main": "main.js",
   "scripts": {