sum of all numbers

Author: wakidurrahman

problems/calculates-the-sum-of-all-numbers.js

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+/**
+ * https://stackoverflow.com/questions/29549836/how-to-find-the-sum-of-all-numbers-between-1-and-n-using-javascript 
+ * *** How to find the sum of all numbers between 1 and N using JavaScript.
+ * *** I'm trying to find a way to calculate the sum of all numbers between 1 to N using JavaScript.
+ *     The following is the code I have tried so far but it doesn't seem to work.
+ * *** Suppose we want to write a function that calculates the sum of all numbers from 1 up to (an including) some number n.
+ *
+ */
+
+// Implementation 1:
+function numberSum(N) {
+  var total = 0;
+  for (var i = 1; i <= N; i++) {
+    total += i;
+  }
+  return total;
+}
+
+//   Implementation 2:
+var res = (n * (n + 1)) / 2;
+
+
+let t1 = performance.now();
+numberSum(1000000000);
+let t2 = performance.new();
+console.log(`Time Elapsed: ${(t2-t1)/100} seconds.`);