Anagram

Author: Tittoh

src/isAnagram/index.js

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+// pick a solution and insert here to run the test.
+
+
+function isAnagram(stringA, stringB) {
+
+    const sanitizeString = function (str) {
+        return str.toLowerCase().replace(/[^a-z\d]/g, '').split('').sort().join('');
+    }
+
+    return sanitizeString(stringA) == sanitizeString(stringB)
+
+}
+
+module.exports = isAnagram;

src/isAnagram/solutions.js

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+// DIRECT COMPARISON
+
+function isAnagram(stringA, stringB) {
+
+    const sanitizeString = function (str) {
+        return str.toLowerCase().replace(/[^a-z\d]/g, '').split('').sort().join('');
+    }
+
+    return sanitizeString(stringA) == sanitizeString(stringB)
+
+}
+
+// CHARACTER MAP COMPARISON
+
+function isAnagram(stringA, stringB) {
+
+    function createCharMap(text) {
+        let charMap = {}
+        for (let char of text) {
+            if (charMap.hasOwnProperty(char)) {
+                charMap[char]++
+            } else {
+                charMap[char] = 1
+            }
+        }
+        return charMap
+    }
+
+    if (stringA.length === stringB.length) {
+
+        let stringAMap = createCharMap(stringA)
+        let stringBMap = createCharMap(stringB)
+
+        for (let char in stringAMap) {
+            if (stringAMap[char] !== stringBMap[char]) {
+                return false
+            }
+        }
+
+        return true
+    } else {
+        return false
+    }
+}

src/isAnagram/test.js

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+const isAnagram = require('./index')
+
+test('isAnagram is a function', () => {
+  expect(typeof isAnagram).toEqual('function')
+})
+
+test('"dog" is an anagram of "god"', () => {
+  expect(isAnagram('dog', 'god')).toBeTruthy()
+})
+
+test('"Scotchy is Scotch!" is an anagram of "Scotch is Scotchy!"', () => {
+  expect(isAnagram('Scotchy is Scotch!', 'Scotch is Scotchy!')).toBeTruthy()
+})
+
+test('"I do not work weekends." is not an anagram of "I do not work weekdays!"', () => {
+  expect(isAnagram('I do not work weekends.', 'I do not work weekdays!')).toBeFalsy()
+})