diff --git a/Project-Euler/Problem10.js b/Project-Euler/Problem10.js
new file mode 100644
index 0000000000..9d90ee5c3f
--- /dev/null
+++ b/Project-Euler/Problem10.js
@@ -0,0 +1,24 @@
+// https://projecteuler.net/problem=10
+
+const isPrime = (number) => {
+  if (number === 2) return true
+  if (number % 2 === 0) return false
+
+  for (let j = 3; j * j <= number; j += 2) {
+    if (number % j === 0) {
+      return false
+    }
+  }
+  return true
+}
+
+const calculateSumOfPrimeNumbers = (maxNumber) => {
+  let sum = 0
+  for (let i = maxNumber - 1; i >= 2; i--) {
+    if (isPrime(parseInt(i)) === true) {
+      sum += i
+    }
+  }
+  return sum
+}
+export { calculateSumOfPrimeNumbers }
diff --git a/Project-Euler/test/Problem10.test.js b/Project-Euler/test/Problem10.test.js
new file mode 100644
index 0000000000..2c1545cd10
--- /dev/null
+++ b/Project-Euler/test/Problem10.test.js
@@ -0,0 +1,16 @@
+import { calculateSumOfPrimeNumbers } from '../Problem10'
+
+describe('checkAnagram', () => {
+  it('Return the sum of prime numbers upto but less than 14', () => {
+    const SUT = calculateSumOfPrimeNumbers(14)
+    expect(SUT).toBe(41)
+  })
+  it('Return the sum of prime numbers upto but less than 10', () => {
+    const SUT = calculateSumOfPrimeNumbers(10)
+    expect(SUT).toBe(17)
+  })
+  it('Return the sum of prime numbers upto but less than 100', () => {
+    const SUT = calculateSumOfPrimeNumbers(100)
+    expect(SUT).toBe(1060)
+  })
+})
diff --git a/String/createPurmutations.js b/String/CreatePermutations.js
similarity index 91%
rename from String/createPurmutations.js
rename to String/CreatePermutations.js
index 1b3cbb06a0..6e5344f742 100644
--- a/String/createPurmutations.js
+++ b/String/CreatePermutations.js
@@ -33,5 +33,4 @@ const createPermutations = (str) => {
   }
   return perms
 }
-
-console.log(createPermutations('abc')) // should print ["abc", "acb", "bac", "bca", "cab", "cba"]
+export { createPermutations }
diff --git a/String/test/CreatePermutations.test.js b/String/test/CreatePermutations.test.js
new file mode 100644
index 0000000000..5bb82848c0
--- /dev/null
+++ b/String/test/CreatePermutations.test.js
@@ -0,0 +1,14 @@
+import { createPermutations } from '../CreatePermutations'
+
+describe('createPermutations', () => {
+  it('expects to generate 6 different combinations', () => {
+    const text = 'abc'
+    const SUT = createPermutations(text)
+    expect(SUT).toStrictEqual(['abc', 'acb', 'bac', 'bca', 'cab', 'cba'])
+  })
+  it('expects to generate 2 different combinations', () => {
+    const text = '12'
+    const SUT = createPermutations(text)
+    expect(SUT).toStrictEqual(['12', '21'])
+  })
+})