Summary - Data types

Combine primitive types, template literals and Math to write a calculation card.

Summary - Data types

In this group you saw data types: five primitives (number, string, boolean, null, undefined), embedding with template literals, Math functions, the unique Symbol and the typeof operator.

Now there are two tasks: one with template literals, one with typeof. First recall what you learned, then apply it.

Exercise Print with a template literal

Declare const product = 'book' and const price = 25. Use a template literal to print product and price in one line; the output should be Item: book, Price: 25.

Show example solution

const product = "book";
const price = 25;
console.log(`Item: ${product}, Price: ${price}`);

Exercise Print multiple types with typeof

Declare let value = 42. Call console.log(typeof value); then reassign value = 'text' and call console.log(typeof value) again. Output should be two lines.

Show example solution

let value = 42;
console.log(typeof value);
value = "text";
console.log(typeof value);

Test yourself

Primitive reminder

____ 42 // returns 'number'

Show answer

typeof 42 // returns 'number'

Match the type concepts

number

Number type
string

String type
boolean

Logical type
symbol

Unique type

Next lesson: Project design

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