Javascript-primitives-and-variables

Question 1

What is the purpose of variables?

Answer 1

give data permeance and something that we can look back at the data in the future.

Question 2

How do you declare a variable?

Answer 2

using (var)

Question 3

How do you initialize (assign a value to) a variable?

Answer 3

using the variable name and use = (equal sign) or using some assignment operator followed by a value.

Question 4

What characters are allowed in variable names?

Answer 4

(no numbers in the beginning), no special characters except: $, and _

Question 5

What does it mean to say that variable names are “case sensitive”?

Answer 5

very strict, everything needs to be exact! (lower case needs to be lower cased, and upper case needs to be used with upper cased!).

Question 6

What is the purpose of a string?

Answer 6

To store characters (ie user’s username, etc…)

Question 7

What is the purpose of a number?

Answer 7

To count, do math, and numerical data

Question 8

What is the purpose of a boolean?

Answer 8

To use it for making decisions

Question 9

What does the = operator mean in JavaScript?

Answer 9

to assign values into variables.

Question 10

How do you update the value of a variable?

Answer 10

place new value and use the = to pertaining variable name. (except using Var).

Question 11

What is the difference between null and undefined?

Answer 11

null (intentional/ from developers) is purposeful but undefined (from computer) is something that has no argument.

Question 12

Why is it a good habit to include “labels” when you log values to the browser console?

Answer 12

1. To see where log is coming from

2. Its easier to keep track and for the sake of other developers and debugging situations

Question 13

Give five examples of JavaScript primitives.

Answer 13

1. string
2. number
3. boolean
4. null
5. undefined.