Count the connected components

count-the-connected-components/index.js

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+// https://www.codewars.com/kata/count-the-connected-components
+
+const countDistricts = city => {
+  let distrCount = 0;
+  const distrMap = {};
+  const markDistr = (place, distr) => {
+    if (place in distrMap) return;
+    distrMap[place] = distr;
+    city[place].map(place => markDistr(place, distr));
+  };
+  Object.keys(city).map((place, i) => markDistr(place, i));
+  return new Set(Object.values(distrMap)).size;
+};