count Vowels

String/CountVowels.js

@@ -0,0 +1,25 @@
+/**
+ * @function countVowels
+ * @description Given a string of words or phrases, count the number of vowels.
+ * @param {String} url - The input string
+ * @return {Number} count
+ * @example countVowels("ABCDE") => 2
+ * @example countVowels("Hello") => 2
+ */
+
+const countVowels = (str) => {
+  if (typeof str !== 'string') {
+    throw new TypeError('Input should be a string')
+  }
+  const vowels = new Set(['a', 'e', 'i', 'o', 'u'])
+  let count = 0
+  for (let i = 0; i < str.length; i++) {
+    const char = str[i].toLowerCase()
+    if (vowels.has(char)) {
+      count++
+    }
+  }
+  return count
+}
+
+export { countVowels }

String/test/CheckVowels.test.js → String/test/CountVowels.test.js

@@ -1,67 +1,67 @@
-import { checkVowels } from '../CheckVowels'
+import { countVowels } from '../CountVowels'
 
-describe('Test the checkVowels function', () => {
+describe('CountVowels', () => {
   it('expect throws on use wrong param', () => {
-    expect(() => checkVowels(0)).toThrow()
+    expect(() => countVowels(0)).toThrow()
   })
 
   it('count the vowels in a string', () => {
     const value = 'Mad World'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(2)
+    const count = countVowels(value)
+    expect(count).toBe(2)
   })
 
   it('should return 0 when input is a string with no vowels', () => {
     const value = 'bcdfgh'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(0)
+    const count = countVowels(value)
+    expect(count).toBe(0)
   })
 
   it('should return 1 when input is a string of length 1 that is a vowel', () => {
     const value = 'a'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(1)
+    const count = countVowels(value)
+    expect(count).toBe(1)
   })
 
   it('should return the correct result when input is in all uppercase letters', () => {
     const value = 'ABCDE'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(2)
+    const count = countVowels(value)
+    expect(count).toBe(2)
   })
 
   it('should return the correct result when input is in all lowercase letters', () => {
     const value = 'abcdefghi'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(3)
+    const count = countVowels(value)
+    expect(count).toBe(3)
   })
 
   it('should return the correct result when input string contains spaces', () => {
     const value = 'abc def   ghi'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(3)
+    const count = countVowels(value)
+    expect(count).toBe(3)
   })
 
   it('should return the correct result when input contains number characters', () => {
     const value = 'a1b2c3'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(1)
+    const count = countVowels(value)
+    expect(count).toBe(1)
   })
 
   it('should return the correct result when input contains punctuation characters', () => {
     const value = 'a!b.ce)'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(2)
+    const count = countVowels(value)
+    expect(count).toBe(2)
   })
 
   it('should return 0 when the input is an empty string', () => {
     const value = ''
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(0)
+    const count = countVowels(value)
+    expect(count).toBe(0)
   })
 
   it('should count multiple occurrences of the same vowel in the input', () => {
     const value = 'aaaaa'
-    const countVowels = checkVowels(value)
-    expect(countVowels).toBe(5)
+    const count = countVowels(value)
+    expect(count).toBe(5)
   })
 })