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Knowledge Based

  • Student can identify the term “Operator”
  • Student can list and explain the 5 primitives in JavaScript.
  • Student can explain the components of an expression
  • Student can identify expressions present in an existing JavaScript program

Questions

  1. Define the term operator and explain what their purpose is in JavaScript.
  2. Please list the five primitives types in JavaScript.
  3. Take a look at the table below and identify the primitive types next to each one.
  4. Write a short sentence explaining how expressions work and why they are useful in JavaScript.
What Primitive Type is this? Answer
45
"I heart JS"
'Pizza is life'
3.14
true
" "
false
'5,5555'

Skill Based

  • Student can appropriately use:
    • Assignment
    • Equality
    • Concatenation
    • Math (+,-,/,*)
  • Student can convert logical statements into algorithms using “if”, “if else” statements
  • Student can read and interpret common runtime errors in the console.
  • Student can use “console.log” to help them develop and debug the state of their programs

Exercise 1

Copy the contents below into a file named main.js and read through each exercise and provide the answers or code required. You should use console.log to help test your code.

/*=========================================================
    Part 1: Variables
*/
var givenName;
// Q: What value is stored in `givenName` right now?
// A:


givenName = "Brett";
// Q: What is `givenName` set to now?
// A:


givenName = givenName;
// Q: What is `givenName` set to now?
// A:

Exercise 2

Using the above code, create a variable called greeting that will store the expression below with givenName being used. You should use console.log to help test your code.

The final output should look like: Hello, how are you Brett?

Exercise 3

Copy the contents below into your file named main.js and read through each exercise and provide the answers or code required. You should use console.log to help test your code.

/*=========================================================
     Part 2: Simple Math
*/
var high = 50;
var low  = 10;


var math = high - low;
// Q: What is `math` set to?
// A:

math = high - "5";
// Q: What is `math` set to?
// A:


// Using the `high` & `low` Variables, work through each of the 4 math operators below and log the answers to the console.
// Write Code Below:

Exercise 4

Copy the contents below into your file named main.js and read through each exercise and provide the answers or code required. You should use console.log to help test your code.

/* =========================================================
     Part 3: Expressions
*/


// Create a variable to calculate your age
// The answer should read "NAME is XX years old"
// The answer should not be written in a comment.
var born = 1900;
var today = 1900;

// Answers Below:



// Store some information following in variables.
var yourName;
var instructorName;

// Update the variables above so the expression reads correctly.
// Answers Below:


// Final Statement
var statement = yourName + " is taking a class at The Iron Yard, my instructor's name is " + instructorName;

Exercise 5

Take the following two variables:

var myAge = 45;
var isOld;

Write a conditional statement that will test if an age is over 100. If it is, set the variable isOld to true otherwise set it to false.

Exercise 6

Each of the following blocks of JavaScript contains errors. Take a look at each and do the following:

  1. Identify which line the error occurs on.
  2. Explain the cause of the error
  3. Fix the error, so the code produces the desired response.
var firstName = "Julia";
var lastName = "Roberts";
var fullName = firstName + lastname;

console.log(fullName); // Julia Roberts
var yearBorn = 1975;
var currentYear = 2016;
Var age = currentYear - yearBorn;

console.log(age); // 41