homework 1

Feynman Writing Prompts - Write out explanations of the following concepts 
like you are explaining it to a 12 year old. Doing this will help you quickly 
discover any holes in your understanding. Ask your questions on Slack.

--Variables:
imagine the variable as an empty bucket where you can save any type of information inside it,
and change what inside it anytime during the program.

--Strings:
 a type of information used to represent alphabetical characters like names, addresses, food and other things

--Functions (arguments, return):
Function is a statement tells the computer to start list of instructions when we call it inside the program,
while the arguments is the values that represent the actual value inside function. And finally return;
returns the values or the arguments after the computation inside the function and end the function.

--if statements:
Its like a police check point where its got a stop sign and stop the flow of the information 

--Boolean values (true, false):
its like yes or no, 0 or 1.



function multiplyByTen(num) {
  return num * 10;
}

function subtractFive(num) {
  return num - 5;
}

function areSameLength(str1, str2) {
  if(str1.length === str2.length) {
  return true;
  }
  return false;
}

function areEqual(x, y) {
  if(x === y){
  return true;
  }
  return false;
}

function lessThanNinety(num) {
  if(num < 90){
  return true;
  }
  return false;
}

function greaterThanFifty(num) {
  if(num > 50){
  return true;
  }
  return false;
}

function add(x, y) {
  return x + y;
}

function subtract(x, y) {
  return x - y;
}

function divide(x, y) {
  return x / y;
}

function multiply(x, y) {
  return x * y;
}

function getRemainder(x, y) {
  return x % y;
}

function isEven(num) {
  if(num % 2 === 0) {
  return true;
  }
  return false;
}

function isOdd(num) {
  if(num % 2 === 1) {
  return true;
  }
  return false;
}

function square(num) {
  return math.pow(num, 2);
}

function cube(num) {
  return math.pow(num, 3);
}

function raiseToPower(num, exponent) {
  return math.pow(num, exponent);
}

function roundNumber(num) {
  return math.round(num);
}

function roundUp(num) {
  return math.ceil(num);
}

function addExclamationPoint(str) {
  var exclamation = '!';
  newStr = str + exclamation;
  return newStr;
}

function combineNames(firstName, lastName) {
  var combined = firstName + ' ' + lastName;
  return combined;
}

function getGreeting(name) {
  greeted = 'hello' + ' ' + name + '!';
  return greeted;
}

// If you can't remember these area formulas then head over to Google or look at the test code.
 
function getRectangleArea(length, width) {
  return length * width;
}

function getTriangleArea(base, height) {
  return 0.5 * base * height;
}

function getCircleArea(radius) {
  return Math.round(Math.PI * Math.pow(radius, 2));
}

function getRectangularPrismVolume(length, width, height) {
  return length * width * height;
}