Implement the anagram problem solution, write tests

07_anagrams/index.js

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+// --- Directions
+// Check to see if two provided strings are anagrams of each other.
+// One string is an anagram of another if it uses the same characters
+// in the same quantity. Only consider characters, not spaces
+// or punctuation.  Consider capital letters to be the same as lower case
+// --- Examples
+//   anagrams('rail safety', 'fairy tales') --> True
+//   anagrams('RAIL! SAFETY!', 'fairy tales') --> True
+//   anagrams('Hi there', 'Bye there') --> False
+
+// Solution 1
+// function anagrams(stringA, stringB) {
+//     const aCharMap = buildCharMap(stringA);
+//     const bCharMap = buildCharMap(stringB);
+//
+//     if(Object.keys(aCharMap).length !== Object.keys(bCharMap).length) {
+//         return false;
+//     }
+//     for (let char in aCharMap) {
+//         if(aCharMap[char] !== bCharMap[char]) {
+//             return false
+//         }
+//     }
+//     return true;
+// }
+//
+// function buildCharMap(str) {
+//     const charMap = {};
+//     for (let char of str.replace(/[^\w]/g, '').toLowerCase()) {
+//         charMap[char] = charMap[char] + 1 || 1;
+//     }
+//     return charMap;
+// }
+
+
+// Solution 2
+function anagrams(stringA, stringB) {
+    return cleanStr(stringA) === cleanStr(stringB);
+}
+
+function cleanStr(str) {
+    return str.replace(/[^\w]/g, '')
+        .toLowerCase()
+        .split("")
+        .sort()
+        .join("");
+}
+module.exports = anagrams;

07_anagrams/test.js

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+const anagrams = require('./index.js');
+
+test('anagrams function exists', () => {
+    expect(typeof anagrams).toEqual('function');
+});
+
+test('"hello" is an anagram of "llohe"', () => {
+    expect(anagrams('hello', 'llohe')).toBeTruthy();
+});
+
+test('"Whoa! Hi!" is an anagram of "Hi! Whoa!"', () => {
+    expect(anagrams('Whoa! Hi!', 'Hi! Whoa!')).toBeTruthy();
+});
+
+test('"One One" is not an anagram of "Two two two"', () => {
+    expect(anagrams('One One', 'Two two two')).toBeFalsy();
+});
+
+test('"One one" is not an anagram of "One one c"', () => {
+    expect(anagrams('One one', 'One one c')).toBeFalsy();
+});
+
+test('"A tree, a life, a bench" is not an anagram of "A tree, a fence, a yard"', () => {
+    expect(
+        anagrams('A tree, a life, a bench', 'A tree, a fence, a yard')
+    ).toBeFalsy();
+});