Edit in JSFiddle

var src = ['apple', 'orange', 'apple', 'banana', 'orange', 'orange'];

var removeDuplication = function(array) {
	var result = [];
	array.forEach(function(element) {
		if(result.indexOf(element) == -1) {
			result.push(element);
		}
	});
	return result;
};

var result = removeDuplication(src);

$('#src').html(src.toString());
$('#result').html(result.toString());

<div id="src"></div>
<div id="result"></div>