Coderbyte Challenge SecondGreatLow

secondGreatLow.js

/* Coderbyte Challenge

Using the JavaScript language, have the function SecondGreatLow(arr) take the array of numbers stored in arr 
and return the second lowest and second greatest numbers, respectively, separated by a space. 
For example: if arr contains [7, 7, 12, 98, 106] the output should be 12 98. 
The array will not be empty and will contain at least 2 numbers.

*/

function SecondGreatLow(arr) { 

	var secLowest,
	    secHighest;

	//sort it up
	arr.sort(function(a, b) {
	    return a - b ;
	});

	//grab the vals
	secLowest = arr[1];
	secHighest = arr[arr.length-2];

	//send em back
	return seclowest + ' ' +secHighest; 
	         
}
   
// keep this function call here 
// to see how to enter arguments in JavaScript scroll down
SecondGreatLow([4, 90]); 

how do you resolve for situations as in the example, where the 7 is repeated twice, and you have to capture 12 in your answer?

@Shahab0622 his code did not generate unique values. You can use a for loop to find unique values or define a function (see discussion on Stack Overflow http://stackoverflow.com/questions/1960473/unique-values-in-an-array/14438954#14438954).