Get Middle Chars

You are going to be given a word. Your job is to return the middle character of the word. If the word's length is odd, return the middle character. If the word's length is even, return the middle 2 characters.

by Pranab Dey

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.1.0/mocha.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.1.0/mocha.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.min.js"></script>
<div style="padding: 10px; color: grey">
  <h4>Problem:</h4> 
  <p>You are going to be given a word. Your job is to return the middle character of the word.
If the word's length is odd, return the middle character.
If the word's length is even, return the middle 2 characters.</p>
  <p><strong>Sample Input:</strong> test</p>
  <p><strong>Sample Output:</strong> es</p>
  
  <br>
  
  <p><strong>Sample Input:</strong> testing</p>
  <p><strong>Sample Output:</strong> t</p>
</div>
<hr><br><br>

<div id="mocha"></div>

JavaScript

// Please note that you cannot edit HTML/CSS or include any libraries. 
// You can use ES2016 (Babel) or ES5 to solve this problem: 

function getMiddle(string) {
	var str = string.length-1;
  if(str%2 === 0){
    return string[str/2];
  }
  else{
    return string[Math.floor(str/2)] + string[Math.floor(str/2+1)];
  }
}


// If your solution pass all tests, you should see a green tick for all test cases
// Don't edit below this line. 
mocha.setup("bdd");
chai.should();

describe('Get Middle Chars', function(){    
    it('Test Case #1 - test', function(){
    		var output = getMiddle('test');
        output.should.equal('es');
    });
    it('Test Case #2 - testing', function(){
    		var output = getMiddle('testing');
        output.should.equal('t');
    });
    it('Test Case #3 - middle', function(){
    		var output = getMiddle('middle');
        output.should.equal('dd');
    });
  });
mocha.run();