Add Project Euler

Author: MaiDeveloper

Project Euler/problem-1-multiples-of-3-and-5.js

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+/**
+ * Project Euler: Problem 1: Multiples of 3 and 5
+ *
+ * If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
+ *
+ * Find the sum of all the multiples of 3 or 5 below the provided parameter value number.
+ */
+
+function multiplesOf3and5(number) {
+  let sum = 0;
+
+  for (let i = 3; i < number; i++) {
+    if (i % 3 === 0 || i % 5 === 0) {
+      sum += i;
+    }
+  }
+
+  return sum;
+}
+
+console.log(multiplesOf3and5(1000));  //233168

Project Euler/problem-2-even-fibonacci-numbers.js

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+/**
+ * Project Euler: Problem 2: Even Fibonacci Numbers
+ *
+ * Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
+ *
+ * 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
+ *
+ * By considering the terms in the Fibonacci sequence whose values do not exceed nth term, find the sum of the even-valued terms.
+ */
+
+
+function fiboEvenSum(n) {
+  let first = 0,
+      second = 1,
+      sum = 0,
+      num = 0;
+
+  for (let i = 0; i <= n; i++) {
+    num = first + second;
+    first = second;
+    second = num;
+
+    if (num % 2 === 0) {
+      sum += num;
+    }
+  }
+
+  return sum;
+}
+
+fiboEvenSum(10);