Create 1876-substrings-of-size-three-with-distinct-characters.js

Author: everthis

1876-substrings-of-size-three-with-distinct-characters.js

@@ -0,0 +1,18 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+ const countGoodSubstrings = function(s) {
+  let res = 0
+  for(let i = 2; i < s.length; i++) {
+    if(chk(s, i)) res++
+  }
+  
+  return res
+};
+
+function chk(s, i) {
+  return s[i - 2] !== s[i - 1] &&
+    s[i - 2] !== s[i] &&
+    s[i - 1] !== s[i]
+}