Arrays – Creation and Indexing
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does [] create an array in JavaScript?
2. Is the first element of an array at index 0?
3. Is () used to access an element by index?
4. Does fruits[1] access the second element of the array?
5. Are curly braces {} used to create an array?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1["apple", "banana", "cherry"] | AWrong - arrays use square brackets, not round brackets | |
| 2fruits[0] | Bcolors[1] | |
| 3Accesses the second element of an array | CWrong - index access uses square brackets, not round brackets | |
| 4The starting index for the first element in an array | DCreates an array holding three string values | |
| 5let a = (1, 2, 3); | EAccesses the first element of the fruits array | |
| 6console.log(fruits(0)); | F0 |
C
Definitions
[]
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
let fruits = _"apple", "banana"_;
2.
console.log(fruits_0_);
3.
let colors = ["red", "blue"];
console.log(colors_1]);
4.
let nums = [1, 2, 3];
console.log(nums[_]);
5.
let sizes = [10, 20, 30];
console.log(sizes[_]);
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let a = (1, 2, 3);
B
console.log(a[0]);
C
let b = [4, 5];
Question 2
A
let c = [1, 2, 3];
B
console.log(c(0));
C
let d = [4, 5];
Question 3
A
console.log(names{0});
B
let names = ["Amy", "Bob"];
C
console.log(names[1]);
Question 4
A
let e = {1, 2, 3};
B
console.log(e[0]);
C
let f = [4, 5];
Question 5
A
let colors = ["red", "blue"];
B
console.log(colors[1)
C
console.log(colors[1]);
Answer Key
Arrays – Creation and Indexing
Section A: Quick Questions
Q1
B — Yes
Q2
B — Yes
Q3
A — No
Q4
A — Yes
Q5
A — No
Section B: Match the Pairs
Q1
["apple", "banana", "cherry"] → Creates an array holding three string values
Q2
fruits[0] → Accesses the first element of the fruits array
Q3
Accesses the second element of an array → colors[1]
Q4
The starting index for the first element in an array → 0
Q5
let a = (1, 2, 3); → Wrong - arrays use square brackets, not round brackets
Q6
console.log(fruits(0)); → Wrong - index access uses square brackets, not round brackets
Section C: Definitions
Q1
[] — Creates an array and, when placed after a variable name, accesses an element by its index.Section D: Fill in the Blanks
Q1
let fruits = ["apple", "banana"];Q2
console.log(fruits[0]);Q3
let colors = ["red", "blue"];
console.log(colors[1]);Q4
let nums = [1, 2, 3];
console.log(nums[0]);Q5
let sizes = [10, 20, 30];
console.log(sizes[2]);Section E: Spot the Error
Q1
A — Arrays use square brackets [], not round brackets ().
Q2
B — Index access uses square brackets, not round brackets.
Q3
A — Index access uses square brackets, not curly braces.
Q4
A — Arrays use square brackets [], not curly braces {}.
Q5
B — The index access is missing its closing square bracket.