# Anagrams in JavaScript

> JavaScript implementation of comparing two strings to check if they are anagrams.

- Canonical: https://dennisokeeffe.com/blog/2019-03-31-js-anagrams
- Published: 2019-03-31
- Updated: 2019-03-31

This blog assumes a global install of `mocha`, although that can also be installed locally. `chai` is also required as the assertion library - install as a dev dependency.

## Writing tests

In `anagrams.mocha.js`:

```javascript
const lib = require("./strcmpSolution");
// const mocha = require('mocha');
const chai = require("chai");
const { expect } = chai;
describe("check lowercase of two strings are anagrams", function () {
  it("should handle basic anagram", function () {
    const res = lib.anagram("race car", "racrace");
    expect(res).to.equal(true);
  });

  it("should handle punctuation", function () {
    const res = lib.anagram("race car", "RACE! CAR!");
    expect(res).to.equal(true);
  });

  it("should handle non-anagrams with different lengths", function () {
    const res = lib.anagram("test", "testa");
    expect(res).to.equal(false);
  });

  it("should handle non-anagrams with same length", function () {
    const res = lib.anagram("tests", "testa");
    expect(res).to.equal(false);
  });

  it("should handle anagrams with varying char length", function () {
    const res = lib.anagram("rrracb", "abcrrrr");
    expect(res).to.equal(false);
  });
});
```

## Anagrams

In `index.js`.

```javascript
const anagram = (strA, strB) => cleanStr(strA) === cleanStr(strB);

const cleanStr = (str) =>
  str.replace(/[^\w]/g, "").toLowerCase().split("").sort().join("");

module.exports = {
  anagram,
};
```

## Testing

Change into directory and run `mocha anagrams.mocha.js`.