Create 002.js

002.js

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+/*
+Source: https://projecteuler.net/problem=2
+
+Problem:
+
+"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 four million, find the sum of the even-valued terms."
+
+
+
+My Algorithm in words:
+
+1. Make an array of fibonacci numbers with numbers from 1 to 4 million
+2. Use a for loop on that array to extract the even numbers
+3. Get the sum of the array with the even numbers
+*/
+
+function fibonacciUntil4Mil() {
+  let term1 = 1;
+  let term2 = 1;
+
+  let fibonacci = [1, 1]; 
+
+  let nextTerm = 2;
+
+  for (let i = 0; i <= 100; i++) {
+    let nextTerm = term1 + term2;
+    term1 = term2;
+    term2 = nextTerm;
+    if (nextTerm < 4000000) {
+       fibonacci.push(nextTerm);
+    }
+  }
+
+  return fibonacci;
+}
+
+function solution() {
+  let fibonacci = fibonacciUntil4Mil();
+  let evenFibonacciNumbers = [];
+
+  for (let number of fibonacci) {
+    if (number % 2 === 0) {
+      evenFibonacciNumbers.push(number);
+    }
+  }
+
+  const add = (a, b) => a + b;
+  return(evenFibonacciNumbers.reduce(add));
+}
+
+console.log(solution());