Created math algorithms fibonacci.js and prime.js

src/algorithms/math/fibonacci.js

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+// Function takes in an integer n, generates an array of the first n Fibonacci numbers, and calculates their sum
+function fibonacciSum(n) {
+    if (n <= 0) {
+        return { sum: 0, sequence: [] };
+    }
+
+    const fibonacciSequence = [0];
+
+    if (n === 1) {
+        return { sum: 0, sequence: fibonacciSequence };
+    }
+
+    fibonacciSequence.push(1);
+
+    for (let i = 2; i < n; i++) {
+        const nextNumber = fibonacciSequence[i - 1] + fibonacciSequence[i - 2];
+        fibonacciSequence.push(nextNumber);
+    }
+
+    const sum = fibonacciSequence.reduce((acc, num) => acc + num, 0);
+
+    return { sum, sequence: fibonacciSequence };
+}
+
+/*
+For testing purposes, change the value of integer n below
+const n = 7;
+*/
+const result = fibonacciSum(n);
+
+console.log(`Sum of the first ${n} Fibonacci numbers:`, result.sum);
+console.log(`Fibonacci sequence:`, result.sequence);

src/algorithms/math/prime.js

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+// Function takes in an integer n and tells the user whether or not it is a prime number
+function isPrime(n) {
+    if (n <= 1) {
+        return false;
+    }
+
+    for (let i = 2; i <= Math.sqrt(n); i++) {
+        if (n % i === 0) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/*
+For testing purposes, change the value of integer inputNumber
+const inputNumber = 23;
+*/
+
+if (isPrime(inputNumber)) {
+    console.log(`${inputNumber} is a prime number.`);
+} else {
+    console.log(`${inputNumber} is not a prime number.`);
+}