Check array for duplicates

by Matthew Day

HTML

<input id="myInput" type="text" />
<button id="addToArray" onclick="noDupes()">Add Item to Array</button>
<div id="output"></div>

JavaScript

var myArr = [];

function noDupes() {
	var output = document.getElementById('output');
  var value = document.getElementById('myInput');
  if(myArr.indexOf(value.value) > 0) { console.log('a');
  	console.log('This item has already been added to the array');
  } else { console.log('b');
  	myArr.push(value.value);
    value.value = '';
  }
  output.innerHTML = myArr;
}