Create 1684-count-the-number-of-consistent-strings.js

Author: everthis

1684-count-the-number-of-consistent-strings.js

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+/**
+ * @param {string} allowed
+ * @param {string[]} words
+ * @return {number}
+ */
+var countConsistentStrings = function(allowed, words) {
+  const set = new Set()
+  for(let c of allowed) set.add(c)
+  let res = 0
+  for(let i = 0, len = words.length; i < len; i++) {
+    const cur = words[i]
+    let b = true
+    for(let c of cur) {
+      if(!set.has(c)) {
+        b = false
+        break
+      }
+    }
+    if(b) res++
+  }
+  
+  return res
+};