answers-frances.md

What value is now stored in the variable name?

var isKing = true;
var name = isKing ? ‘Arthur’ : ‘Hank’;

ANSWER

name = ‘Arthur’ 
# name is Arthur. This short syntax for an if statement is called ternary operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator

What is the difference between == and === in Javascript? ANSWER

# Both are conditional operators checking if both sides are equal. When checking equality
# it is always safer to use === instead of == because the === is also checking the type,
# not just the value
# For instance
'5' == 5 # true
'5' === 5 # false

Write a function that takes two numbers as arguments and returns the sum of the two numbers in Javascript ANSWER

function addNumbers(a, b) { 
 	return a + b;
};

Write a function that takes an array as an argument and prints out the numbers in the array that are greater than 5 (for example foo([3,6,1,7]) would print out 6 and 7) in Javascript ANSWER

function numStrings(array) {
  		for(var i = 0; i < array.length; i++) {
    		if(array[i] > 5){
      		console.log(array[i])
    			}	
  		}
}

numStrings([3,6,1,7]) # prints out 6 7

Write a for loop that will iterate from 0 to 20. For each iteration, it will check if the current number is even or odd, and report that to the screen in Javascript ANSWER

for(i=0; i =< 20; i++) {
   if(i%2 == 0) {
    console.log(“even”);
   }else{
    console.log(“odd”);  
  }
}

What does 'this' refer to when used in a Java method?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this

Create an object that has properties with name = "fred" and major="music" and a property that is a function that takes 2 numbers and returns the smallest of the two, or the square of the two if they are equal. ANSWER

var newObj = {
    name: "fred", 
    major: "music",
    smallestOrSquare: function(numOne, numTwo) {
        if (numOne < numTwo) {
            return numOne;
         } else if (numOne > numTwo) {
             return numTwo;
         } else {
             return numOne *= numTwo
          }
     }
}

What’s the result of executing this code and why?

function test() {
   console.log(a);
   console.log(foo());

   var a = 1;
   function foo() {
      return 2;
   }
}

test();

ANSWER

# First console.log is undefined bc a is not yet defined.
# Second console.log is 2, as it is the return value of the inner foo function.

Ruby

Write a function that takes two numbers as arguments and returns the sum of the two numbers in Ruby ANSWER

def two_numbers(x,y) 
  return x + y
end

puts two_numbers(2,3)

# A code block is wrapped in def ... end instead of {..}
# No semicolons
# The last value in a function is automtically returned in Ruby

Write a function that takes an array as an argument and prints out the numbers in the array that are greater than 5 (for example foo([3,6,1,7]) would print out 6 and 7) in Ruby ANSWER

def another_loop(array) {
   array.each do |number|
     if number > 5
       puts number
     end
   end
 end

another_loop([1,2,3,4,5,6,7,8,9,10])

# No loop but each funtion in Ruby
# if statement in if .. end instead of if {...}

Write a for loop that will iterate from 0 to 10. For each iteration of the for loop, it will multiply the number by 9 and log the result (e.g. "2 * 9 = 18") in Ruby ANSWER

 11.times do |number|
   puts number * 9
 end

Classes

Create a Celsius class, that takes the temperature as a parameter. ANSWER

 class Celcius 
   def initialize(temperature)
   end
 end

In that same class, define a method that returns the temperature in Fahrenheit. For the conversion we can use the formula temperature*1.8 + 32. Round up the result so it doesn’t contain any decimal values. ANSWER

 class Celcius 
   def initialize(temperature)
     @temperature = temperature
   end
   
   def fahrenheit
     (@temperature * 1.8 + 32).round
   end
 end

In that same class, create a to_s method, that returns the Celsius temperature formatted e.g. 16 degrees C ANSWER

 class Celcius 
   def initialize(temperature)
     @temperature = temperature
   end
   
   def fahrenheit
     (@temperature * 1.8 + 32).round
   end
   
   def to_s
     "#{@temperature} degrees C"
   end
 end

Git

Assume that you created a new file in a project. What would you do to start tracking it under git (let's assume that the direktory you are currently in already exists)? ANSWER

$ git add file_name

In the morning, what would you do to make sure you have the most current git branch on your local machine? ANSWER

$ git pull

Command line

How would you create a new folder named 'new_folder' in the command line? ANSWER

$ mkdir new_folder

Assuming you created that folder, how would you access that folder using the command line? ANSWER

$ cd new_folder

Ingelheim/answers-frances.md