Selectively replace multiple instances of a character within a string: Difference between revisions

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@@ Line 272: / Line 272: @@
         // the nth instances of various characters.
         s => mapAccumL(
-            (a, c) => c in ruleMap ? (() => {
+            (a, c) => c in a ? (() => {
-                const
+                const ds = a[c];
-                    i = a[c] || 0,
-                    ds = ruleMap[c];
-                return [
+                return 0 < ds.length ? [
-                    Object.assign(a, {[c]: 1 + i}),
+                    Object.assign(a, {[c]: ds.slice(1)}),
-                    i < ds.length ? (
+                    ds[0] || c
-                        ds[i] || c
+                ] : [a, c];
-                    ) : c
-                ];
             })() : [a, c]
-        )({})([...s])[1].join("");
+        )(ruleMap)([...s])[1].join("");