find-the-nth-largest-number-in-an-array

gistfile1.txt

// http://xorswap.com/questions/167-find-the-nth-largest-number-in-an-array

function testData() {
    return [10, 1001, 15, 7, 33, 1001, 2, 0, 99, 131];
};

function sortAsc(a, b) {
    if(a < b) {
        return -1;    
    }else if(a === b) {
        return 0;
    }else {
        return 1;
    }      
};

function nthLargest(theArray, n) {
    if(theArray.length === 1) return theArray[0];
    if(theArray.length - 1 < n) return undefined;

    var sorted = theArray.sort(sortAsc);

    var i = (theArray.length - 1) - n;  
        
    return theArray[i];
};

console.log( "testData: " + testData() );
console.log( "sorted testData: " + testData().sort(sortAsc) );
console.log( nthLargest(testData(), 0) );
console.log( nthLargest(testData(), 1) );
console.log( nthLargest(testData(), 2) );
console.log( nthLargest(testData(), 3) );
console.log( nthLargest(testData(), 200) );