ArrayMethodsAndTests/push.html at master · joshmerritt/ArrayMethodsAndTests · GitHub

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<script src="../simpletest.js"></script>
<script>

/* Prototype function
    function push(originalArray, element1 [,...[,elementN]]) {
        elementsToAdd = arguments.length - 1;
        startingPosition = originalArray.length - 1;
        for(var i = 1; i < elementsToAdd; i++) {
            originalArray[originalLength + i] = argument[i];
        }
        return originalArray.length;;
    }
*/

function push(originalArray,element1) {
        var elementsToAdd = arguments.length - 1;
        var startingPosition = originalArray.length - 1;
        for(var i = 1; i <= elementsToAdd; i++) {
            originalArray[startingPosition + i] = arguments[i];
        }
        return originalArray.length;;
    }


tests({

  'It should return the length of the array': function () {
    var testArray = [1,2,3];
    var returnResult = push(testArray,4);
    eq(returnResult,4);
  },

  'It should accept multiple elements to append': function () {
    var testArray = [1,2,3];
    var returnResult = push(testArray,4,5,'six');
    eq(returnResult,6);
  },

  'It should add elements to the original array': function () {
    var testArray = [1,2,3];
    var returnResult = push(testArray,4,5,6);
    eq(returnResult,6);
    eq(testArray[3],4);
    eq(testArray[4],5);
    eq(testArray[5],6);
  },

});

</script>