Week 1 Assessment

Bash (Terminal)

Assume your present working directory is $ ~/buffy

1. Make two directories inside ~/buffy: scoobies and vamps
   
   
   

$mkdir scoobies vamps

2. Make files in scoobies named buffy.txt, giles.txt and angel.txt
   
   
   

$touch scoobies/buffy.txt scoobies/giles.txt

3. Copy angel.txt into the vamps directory
   
   

$cp scoobies/angel.txt vamps/angle.txt

4. Delete the vamps directory and everything inside it
   
   

$rm -rf vamps/

JS Variables

1. Assign the string "Jack" to a variable called captain
   
   

var captain = "Jack"

2. Using the captain variable, use string concatenation to form the string "Oh Jack, my Jack!", assigning it to a variable named phrase
   
   

var phrase = "Oh ".concat(captain).concat(", my ").concat(captain).concat("!")

JS Conditionals

var souls = 3;
var lifeRafts = 2;

1. Write an if statement that console.logs "SOS!" if there are more souls than lifeRafts
   
   

if (souls > lifeRafts) { console.log("SOS!"); }

Data Structures - JS Arrays

1. Create an array named weekend with just 'Saturday' in it
   
   

var weekend = ["Saturday"]

2. Add 'Sunday' to the end of the weekend array
   
   

weekend.push("Sunday")

3. Add 'Friday' to the front to the front of the weekend array
   
   

weekend.unshift("Friday")

4. Access 'Saturday' in the array and assign to a variable named day
   
   

var day = weekend[1]

5. Remove 'Friday' from the array
   
   

weekend.splice(0,1)

Data Structures - JS Objects

1. Write an object literal named brain having a property of energyLevel with a value of 10 as a number
   
   

var brain = { energyLevel: 10 }

2. Assign the property of energyLevel to a variable named energy
   
   

var energy = brain.energyLevel

3. Add a dream property to the brain object that holds the string 'electric sheep'

var brain = { energyLevel: 10, dream: 'electric sheep', };

4. Add a dayDream property to the brain object that holds the object { lunch: ['burger', 'beer'] }
   
   

var brain = { energyLevel: 10, dream: 'electric sheep', dayDream: { lunch: ['burger', 'beer'] }, };

5. Add another element pudding to the lunch array inside the brain object
   
   

JS Functions

1. Write a function to return the area of a rectangle (the product of its length and its width)
   
   

2. Invoke the function with 3 and 4 as arguments and save it to a variable named result