iancover

What is scope? Your explanation should include the idea of global vs. local scope.

SCOPE IS THE UMBRELLA OR ROOM WHERE THE JS INTERPRETER IS LOOKING FOR VARIABLES TO USE, THESE COULD BE
IN THE GLOBAL SCOPE WHICH COULD BE THE UMBRELLA FOR MANY FUNCTIONS IN MANY FILES OR IT COULD BE LOCAL, 
WHICH WOULD BE IN JUST A BLOCK OF INSTRUCTIONS FOR ONE FUNCTION

Why are global variables avoided?

THEY CAN BE HARD TO TRACK IF THERE'S ALOT OF SCRIPT TO SEARCH ON AND COULD CAUSE BUGS
  

iancover

// Compute Average Drill

function average(numbers) {
  var avg = numbers.reduce(function sum(total,num) {
    return total + num;
  })
  return avg/numbers.length;
}

// I used the .reduce() method with .length

iancover

// Array Ex 6
function makeList(item1, item2, item3) {
  return [item1,item2,item3];
}

// tests
function testMakeList() {
  var items = ["prime rib", "fried goat cheese salad", "fish tacos"];
  var result = makeList(items[0], items[1], items[2]);
  

iancover

// jQuery example
function main() {
  try {
    doAllTheThings();
  }
  catch(e) {
    console.error(e);
    reportError(e);
  }
    

iancover

function computeArea(width, height) {
  return width*height
}

function testComputeArea() {
  var width = 3;
  var height = 4;
  var expected = 12;
  if (computeArea(width, height) === expected) {
    console.log('SUCCESS: `computeArea` is working');

iancover

function shouter(whatToShout) {
  return whatToShout.toUpperCase () + '!!!'
}

function testShouter() {
  var whatToShout = 'as you can hear i am whispering';
  var expected = 'AS YOU CAN HEAR I AM WHISPERING!!!';
  if (shouter(whatToShout) === expected) {
    console.log('SUCCESS: `shouter` is working');
  }