Exercises.en.md

Exercises

Identifiers

1. Define variable to store your name as a string.
2. Define constant to store your birth year as a number.
3. Prepare function to print greeting with single argument.

Loops

4. Implement function range(start: number, end: number): array returning array with all numbers from the range [15, 30] including endpoints.
5. Implement function rangeOdd(start: number, end: number) returning array with all odd numbers from the range [15, 30] including endpoints.

Functions

6. Call function from function in loop

• Implement function average with signature average(a: number, b: number): number calculating average (arithmetic mean).
• Implement function square with signature square(x: number): number calculating square of x.
• Implement function cube with signature cube(x: number): number calculating cube of x.
• Call square and cube in loop 0 to 9, pass results to function average on each iteration. Add calculation results to array and return this array from function calculate.

Call functions square and cube in loop, then pass their results to function average. Print what average returns.

Objects

7. Do following tasks inside function fn (see stub: 7-objects.js)

• Define constant object with single field name.
• Define variable object with single field name.
• Try to change field name.
• Try to assign other object to both identifiers.
• Explain script behaviour.

8. Implement function createUser with signature createUser(name: string, city: string): object. Example: createUser('Marcus Aurelius', 'Roma') will return object { name: 'Marcus Aurelius', city: 'Roma' }

Collections: Array, Hash (Object)

9. Implement phone book using array of records.

• Define Array of objects with two fields: name and phone. Object example: { name: 'Marcus Aurelius', phone: '+380445554433' }.
• Implement function findPhoneByName with signature findPhoneByName(name: string): string. Returning phone from that object where field name equals argument name. Use for loop for this search. A. Implement phone book using hash (also known as object).
• Define hash with key contains name (from previous example) and value contains phone.
• Implement function findPhoneByName with signature findPhoneByName(name: string): string. Returning phone from hash/object. Use hash[key] to find needed phone.