Category talk:Wren-seq: Difference between revisions

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@@ Line 443: / Line 443: @@
         }
         return [old, swap]
+    }
+    // Removes all instances of 'value' from 'a'.
+    // Returns 'value' if there were any removals, otherwise 'null'.
+    static removeAll(a, value) {
+        isList_(a)
+        if (a.isEmpty) return null
+        var found = false
+        for (i in a.count-1..0) {
+            if (a[i] == value) {
+               a.removeAt(i)
+               found = true
+            }
+        }
+        return found ? value : null
+    }
+    // Return a map whose keys are 'k' and corresponding values 'v'
+    // where 'k' and 'v' are suitable lists.
+    static toMap(k, v) {
+        isList_(k)
+        isList_(v)
+        if (k.count != v.count) Fiber.abort("The number of keys and values must be the same.")
+        var m = {}
+        for (i in 0...k.count) m[k[i]] = v[i]
+        return m
     }