Merge pull request #3521 from aadil42/patch-71

Create 2125-number-of-laser-beams-in-a-bank.js

Author: Ykhan799

Diff for: javascript/2125-number-of-laser-beams-in-a-bank.js

@@ -0,0 +1,31 @@
+/**
+ * Two Pointers | Math | Array
+ * Time O(n) | Space O(1)
+ * https://leetcode.com/problems/number-of-laser-beams-in-a-bank/
+ * @param {string[]} bank
+ * @return {number}
+ */
+var numberOfBeams = function(bank) {
+
+    let totalBeams = 0;
+
+    let left = 0;
+    let right = left + 1;
+
+    const countBeam = (beam) => {
+        return beam.split("").filter((b) => b === "1").length;
+    }
+
+    while (right < bank.length) {
+        while (right < bank.length && !countBeam(bank[right])) {
+            right++;
+        } 
+
+        if (right < bank.length) {
+            totalBeams += countBeam(bank[left]) * countBeam(bank[right]);
+        }
+        left = right;
+        right++;
+    }
+    return totalBeams;
+};