Type Conversion

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Does Number() convert a value into a number?

A No

B Yes

2. Does String() convert a value into a string?

A Yes

B No

3. Is 'number' with a lowercase n a valid conversion function?

A No

B Yes

4. Does Boolean() convert a value into true or false?

A No

B Yes

5. Do type conversion functions need parentheses around the value?

A Yes

B No

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Number("5")		AConverts the number 12 into the string "12"
2String(12)		BConverts the string "5" into the number 5
3Converts a value into true or false		CWrong - String() needs parentheses around the value
4Turns text into a number data type		DBoolean(1)
5let n = number("5");		EWrong - 'Number' must start with a capital N
6let text = String age;		FNumber(input)

Definitions

Number()

Fill in the Blanks

Complete each line of code by filling in the missing parts.

let ageText = ______(age);

let num = ______(input);

let flag = _______(1);

let count = ______("8");

let label = ______(score);

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A let num = "5";

B let x = number(num);

C console.log(x);

Question 2

A let age = 12;

B console.log(text);

C let text = string(age);

Question 3

A let b = boolean(val);

B let val = 1;

C console.log(b);

Question 4

A let s = "9";

B let n = Number(s);

C let m = Numbr(s);

Question 5

A let age = 20;

B let txt2 = Sting(age);

C let txt = String(age);

Answer Key

Type Conversion

Section A: Quick Questions

B — Yes

A — Yes

A — No

B — Yes

A — Yes

Section B: Match the Pairs

Number("5") → Converts the string "5" into the number 5

String(12) → Converts the number 12 into the string "12"

Converts a value into true or false → Boolean(1)

Turns text into a number data type → Number(input)

let n = number("5"); → Wrong - 'Number' must start with a capital N

let text = String age; → Wrong - String() needs parentheses around the value

Section C: Definitions

Number() — Converts a value, like a string, into a number data type.

Section D: Fill in the Blanks

let ageText = String(age);

let num = Number(input);

let flag = Boolean(1);

let count = Number("8");

let label = String(score);

Section E: Spot the Error

B — 'Number' must start with a capital N, not lowercase.

C — 'String' must start with a capital S, not lowercase.

A — 'Boolean' must start with a capital B, not lowercase.

C — 'Number' is misspelled as 'Numbr'.

B — 'String' is misspelled as 'Sting'.