DevLeague-Day2-Prep-Notes-Answers

index.js

// ++ NOTES

/**
 * console.log() --> PRINT TO SCREEN
 * function () {} --> Declare a function (but don't run it)
 * {functionName}(arg1, arg2) --> Actually using the function by name
 */

// GLOBAL VARIABLES
var foo = 2;
var bar = 2;
var random = Math.random();

// GLOBAL NAMED FUNCTION
function test(foo, bar) { // arguements
  var baz = 3; // local variable
  return foo + ' ' + bar + baz;
}

var baz = test(foo, bar);
console.log(baz); // 2 23



// GLOBAL ANONYMOUS FUNCTION
var func = function() {
  return foo + bar + random;
};

var bib = func(bar);
console.log(bib); // 4.230480234


// IF EXAMPLE
var test = Math.random(); // something true
if (test) { // truthy outcome
  // do this
}
else { // falsy outcome
  // do something else
}

// FOR LOOP EXAMPLE
for (var i=0; i<3; i++) {
  console.log(i);
}

// WHILE LOOP EXAMPLE
var i = 0;
while (i<3) {
  console.log(i);
  i++;
}



// ++ Answers
var a = 1;
var b = 2;

// ADD
function add(x, y) {
  return x + y;
}
var sum = add(1,2);
console.log(sum);

// subtract
function subtract(x, y) {
  return x - y;
}
var difference = subtract(a, b);
console.log(difference);

// multiply
function multiply(x, y) {
  return x * y;
}
var product = multiply(a, b);
console.log(product);

// checkDifference
function checkDifference(x) {
  return 'My football team lost ' + x + ' times this week';
}
console.log(checkDifference(difference));

// checkSum
function checkSum(x) {
  return 'I CAN ADDZ ' + x + ' NUMBERS';
}
console.log(checkSum(sum));

// checkProduct
function checkProduct(x, y) {
  return x * y;
}
console.log(checkProduct(product, difference));

// addThenSubtract
function addThenSubtract(x, y, z) {
  var first = add(x,y);
  var second = subtract(first, z);
  return second;
}
console.log(addThenSubtract(5, 2, 3));

// addThenMultiply
function addThenMultiply(x, y, z) {
  var first = add(x, y);
  var second = multiply(first, z);
  return second;
}
var howMany = addThenMultiply(5, 2, 3);
console.log('howMany: ', howMany);

// createFullName
function createFullName(x, y) {
  return x + ' ' + y;
}
var myFullName = createFullName('Ed', 'Kim');
console.log(myFullName);

// verifyDrinkingAge
function verifyDrinkingAge(x) {
  return x >= 21;
}
var canDrinkBeer = verifyDrinkingAge(34);

// throwParty
function throwParty (x) {
  if (x) { return 'This Party will have an open bar'; }
  else { return 'The Party will have tons of Cake!'; }
}
console.log(throwParty(canDrinkBeer));

// eatFood
function eatFood(x, y, z) {
  var name = createFullName(x, y);
  return name + ' loves to eat ' + z;
}
console.log(eatFood('Ed', 'Kim', 'Pizza'));

// repeater
function repeater(x, y) {
  for (var i = 0; i < x; i++) {
    if (y) { console.log('Bacon Pancakes, makin\' Bacon Pancakes...'); }
    else { console.log('Let it go.... LET IT GOOOOOOoOoOoOo...'); }
  }
}
repeater(howMany, canDrinkBeer);