JavaScript Review

Variables

100

Keyword used to create a constant variable

const

200

Keyword that creates a reassignable variable

let

300

What the equal sign (=) is called in a statement that creates a variable

assignment operator

400

What happens if you try to reassign a variable created with const?

error

500

let count = 5

Show how to reassign the value of count to 6

count = 6

Strings

100

Punctuation that surrounds strings

quotation marks

200

1. "one two".length

2. "one two"[0]

1. 7

2. "o"

300

True or false? "A" === "a"

false

400

"banana".lastIndexOf("n")

4

500

Two ways of concatenating "a" and "b"

"a" + "b"

"a".concat("b")

Functions

100

Keyword used to define a function

function

200

Keyword that determines the function's output value

return

300

Special variables that store input values

parameters or arguments

400

Show how you'd call a function called test pass to it a string, "word"

test("word")

500

What does a function return if it is missing a return statement?

undefined

Arrays

100

An array is . . .

an ordered list of values (strings, numbers, booleans, arrays, etc.)

200

Index of an array's first value

0

300

Which is bigger: an array's last index or its length?

Length

400

Name of the method that adds a value to the end of an array

push

500

let a = ["a", "b", "c", "d"]

a[a.length - 1]

"d"

Loops

100

Name two types of loops

while, for, for...of, for...in, forEach

200

A loop keeps executing until...

it's condition evaluates to false

300

What you call a loop that never stops executing

infinite loop

400

What kind of loop would you use to iterate through the values in an array?

for...of

500

True or false: anything you can do with a while loop you can do with a for loop?

true