Part 2- A Smarter Way to Learn JavaScript

Question 1

What’s the tool to get input from a website visitor?

Answer 1

Prompt

Question 2

What’s the format for prompt?

Answer 2

var question1 = prompt(“What is your street’s name?”, “Suggested response”);

Question 3

How do you suggest an answer for a propmt?

Answer 3

var nameOfVariable = prompt(“Question goes here”, “Suggested answer”);

Question 4

Which part of a prompt statement has the user’s response assigned to it?

Answer 4

The variable

Question 5

What does the second argument in a prompt statement mean? Like the X in this:
var redFin = prompt (“Hi”, X );

Answer 5

It’s the suggested response.

Question 6

What’s the syntax for an IF statement that says, if x = y, then run the code.

Answer 6

if (x === y) {
//code that will be run
}

Note the space between IF and the first parentheses. It’s not required, but is the the accepted style.

Question 7

What is the best, strictest symbol for “equals”

Answer 7

===

The strict equality ( === ) operator checks whether its two operands are equal, returning a Boolean result.

Unlike the equality operator, the strict equality operator always considers operands of different types to be different.

Question 8

What are these?

!==
>=
<=

Answer 8

Comparison Operators (aka Relational Operators)

Question 9

What is the best, strictest symbol for “does not equal”

Answer 9

!==

Question 10

What’s the difference between an ELSE statement and an ELSE IF statement?

Answer 10

The ELSE statement executes something no matter what. It is not testing anything for truth.

But ELSE IF tests a condition. So it’s like another IF statement that would execute after the previous one failed to.

Question 11

Can an IF statement test for multiple conditions? If so, how?

Answer 11

Yes, you can test for multiple conditions.
Join them with && for “and”.
You can also join them with || for “or.”
You can avoid ambiguity by grouping conditions with parentheses, like in math.

Question 12

In an IF statement, what’s the symbol for and?

Answer 12

&&

Question 13

In an IF statement, what’s the symbol for or?

Answer 13

||

Question 14

If you have multiple conditions to test in an IF statement, how do you avoid ambiguity?

Answer 14

Use parentheses to group the terms that should go together

Question 15

If there are several IF statements, does JS go through them all?

Answer 15

No. JS stops testing after the first true one it finds.

Question 16

Nested IF statements execute the code between the { } just like any other code, except the code is…

Answer 16

…another IF statement

Question 17

How is an array like a variable?

Answer 17

an array is just a variable with multiple values (or elements)

Question 18

What’s the index number of the first element in an array?

Answer 18

when you’re counting the elements in an array, always start with 0.

Question 19

In an array, what do you call the 0, 1, 2, etc.?

Answer 19

The 0, 1, 2, etc. are the array’s INDEX

Question 20

How do you create an array?

Answer 20

var arrayName = [6, 7, 8];

arrays are created just like variables by using the VAR keyword. The elements (values) are listed in square brackets and separated by a space and a comma.