Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
// noprotect
// ^^ `noprotect` is here to prevent a bug with jsbin and for loops.

function average(numbers) {
  var total = numbers[0];
  for (var i=1; i < numbers.length; i++) {
    total+= numbers[i];
   return total/numbers.length;
}


/* From here down, you are not expected to
   understand.... for now :)


   Nothing to see here!

*/


// tests

function testFunctionWorks(fn, input, expected) {
  if (fn(input) === expected) {
    console.log('SUCCESS: `' + fn.name + '` works on `[' + input + ']`');
    return true;
  }
  else {
    console.log(
      'FAILURE: `' + fn.name + '([' + input + '])` should be ' + expected +
      ' but was ' + fn(input)
    );
    return false;
  }
}

(function runTests() {
  var numList1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  var correctAns1 = 5.5;
  var numList2 = [0, -1, 1];
  var correctAns2 = 0;

  var testResults = [
    testFunctionWorks(average, numList1, correctAns1),
    testFunctionWorks(average, numList2, correctAns2)
  ];
  var numPassing = testResults.filter(function(result){ return result; }).length;
  console.log(numPassing + ' out of ' + testResults.length + ' tests passing.')
})();
</script>


<script id="jsbin-source-javascript" type="text/javascript">// noprotect
// ^^ `noprotect` is here to prevent a bug with jsbin and for loops.

function average(numbers) {
  var total = numbers[0];
  for (var i=1; i < numbers.length; i++) {
    total+= numbers[i];
   return total/numbers.length;
}


/* From here down, you are not expected to
   understand.... for now :)


   Nothing to see here!

*/


// tests

function testFunctionWorks(fn, input, expected) {
  if (fn(input) === expected) {
    console.log('SUCCESS: `' + fn.name + '` works on `[' + input + ']`');
    return true;
  }
  else {
    console.log(
      'FAILURE: `' + fn.name + '([' + input + '])` should be ' + expected +
      ' but was ' + fn(input)
    );
    return false;
  }
}

(function runTests() {
  var numList1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  var correctAns1 = 5.5;
  var numList2 = [0, -1, 1];
  var correctAns2 = 0;

  var testResults = [
    testFunctionWorks(average, numList1, correctAns1),
    testFunctionWorks(average, numList2, correctAns2)
  ];
  var numPassing = testResults.filter(function(result){ return result; }).length;
  console.log(numPassing + ' out of ' + testResults.length + ' tests passing.')
})();</script></body>
</html>