sj-ransom

Object creator

function createMyObject(key1, key2, key3, key4) {
  obj = {
    foo: 'bar',
    answerToUniverse: 42,
    'olly olly': 'oxen free',
    sayHello: function sayHello() {
      return `hello`
    }

sj-ransom

What is scope? Your explanation should include the idea of global vs. local scope.
Scope refers to the boundaries in which a variable or constant will interact with functions in code.
A variable has global scope when it is defined outside of a function. Global variables will be recognized
by functions throughout a folder of JS files. 
A variable has local scope when it is defined within a function. A local variable is only recognized 
within its function.

Why are global variables avoided?
As an app becomes more complex and requires many functions, global variables can cause there to be bugs 
which are difficult to find. For example, if a global variable is defined in one JS file and altered in a function in another JS File in another,

sj-ransom

max and min (without sort)

function max(numbers) {
  maxNumber = numbers[0];
  for (let i = 0; i < numbers.length; i++) {
    if (maxNumber < numbers[i]) {
      maxNumber = numbers[i];
    }
  }
  return maxNumber

sj-ransom

Array copying I

function firstFourItems(array) {
  return array.slice(0, 4)
}

function lastThreeItems(array) {
  return array.slice(-3)
}

sj-ransom

Creating arrays

function makeList(item1, item2, item3) {
  return [item1, item2, item3]
}

Adding array items

function addToList(list, item) {
  list.push(item);

sj-ransom

function doTrafficLights() {
  const activeLight = getActiveLight();
  if (activeLight === 'red') {
    turnRed()
  } else if (activeLight ==="green") {
    turnGreen()
  } else {
    turnYellow()
  }
}

sj-ransom

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

function celsToFahr(celsTemp) {
  return celsTemp * 1.8 + 32;
}

function fahrToCels(fahrTemp) {
  return (fahrTemp - 32) * 1.8;

sj-ransom

function textNormalizer(text) {
  return `${text.toLowerCase().trim()}`
}

function shouter(whatToShout) {
  return `${whatToShout.toUpperCase()}!!!`;
}

function wisePerson(wiseType, whatToSay) {
  return `A wise ${wiseType} once said: "${whatToSay}".`;