feat: Added string symmetry check algorithm

String/CheckMirrorString.js

@@ -0,0 +1,54 @@
+/**
+ * @function checkMirrorString
+ * @description Given a string check whether string is symmetric or not or (reflection in a mirror)
+ * @param {String} inputString
+ * @returns {String}
+ * @example AAMMAA -> Is a mirror string
+ * @example PAAAP -> Not a mirror string
+ */
+
+// time complexity of this algorithm is BigO(N/2) where N is length of string
+const checkMirrorString = (inputString) => {
+  if (typeof inputString !== 'string') {
+    return 'Not a string'
+  }
+  if (!/^[a-zA-Z]+$/.test(inputString)) {
+    return 'String should only contains alphabet'
+  }
+  if (inputString.length === 0) {
+    return 'Input string should not be empty'
+  }
+  const lowerCaseSymmetricCharacters = new Set(['o', 'i', 'l', 'w', 'v', 'x'])
+  const upperCaseSymmetricCharacters = new Set([
+    'A',
+    'H',
+    'I',
+    'M',
+    'O',
+    'T',
+    'U',
+    'V',
+    'W',
+    'X'
+  ])
+  let i = 0
+  let j = inputString.length - 1
+  let leftPointerCharacter
+  let rightPointerCharacter
+  while (i <= j) {
+    leftPointerCharacter = inputString.at(i)
+    rightPointerCharacter = inputString.at(j)
+    if (
+      (leftPointerCharacter === rightPointerCharacter &&
+        lowerCaseSymmetricCharacters.has(leftPointerCharacter)) ||
+      upperCaseSymmetricCharacters.has(rightPointerCharacter)
+    ) {
+      i++
+      j--
+    } else {
+      return 'Not a mirror string'
+    }
+  }
+  return 'Is a mirror string'
+}
+export { checkMirrorString }

String/test/CheckMirrorString.test.js

@@ -0,0 +1,27 @@
+import { checkMirrorString } from '../CheckMirrorString'
+
+describe('checkMirrorString', () => {
+  it('CheckMirrorString -> ', () => {
+    const word = 'HOAMMAOH'
+    const res = checkMirrorString(word)
+    expect(res).toBe('Is a mirror string')
+  })
+
+  it('check for npn mirror string -> ', () => {
+    const word = 'JAVASCRIPT'
+    const res = checkMirrorString(word)
+    expect(res).toBe('Not a mirror string')
+  })
+
+  it('string with numeric value -> ', () => {
+    const word = 'Kop12Po'
+    const res = checkMirrorString(word)
+    expect(res).toBe('String should only contains alphabet')
+  })
+
+  it('number as a string -> ', () => {
+    const word = 1234
+    const res = checkMirrorString(word)
+    expect(res).toBe('Not a string')
+  })
+})