merge: Add new IsPalindrome implementation (#1046)

String/test/IsPalindrome.test.js

@@ -0,0 +1,33 @@
+import { isPalindromeIterative } from '../IsPalindrome'
+
+describe('isPalindrome', () => {
+  it('expects to return true with empty string', () => {
+    expect(isPalindromeIterative('')).toEqual(true)
+  })
+
+  it('expects to return true when length of input is 1', () => {
+    const numberInput = 6
+    const stringInput = 'a'
+    expect(isPalindromeIterative(numberInput)).toEqual(true)
+    expect(isPalindromeIterative(stringInput)).toEqual(true)
+  })
+
+  it('expects to return true when input is palindrome', () => {
+    expect(isPalindromeIterative(121)).toEqual(true)
+    expect(isPalindromeIterative('yooy')).toEqual(true)
+    expect(isPalindromeIterative('19noon91')).toEqual(true)
+    expect(isPalindromeIterative('!*tyyt*!')).toEqual(true)
+  })
+
+  it('expects to return false when input is not palindrome', () => {
+    expect(isPalindromeIterative('hello')).toEqual(false)
+    expect(isPalindromeIterative(189)).toEqual(false)
+    expect(isPalindromeIterative('!*98[!')).toEqual(false)
+  })
+
+  it('expects to throw error when input is not a string or a number', () => {
+    expect(() => isPalindromeIterative(undefined)).toThrowError()
+    expect(() => isPalindromeIterative({ key: 'val' })).toThrowError()
+    expect(() => isPalindromeIterative([])).toThrowError()
+  })
+})