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Score calculation

Write the score calculation logic.

Score calculation logic

Score calculation is the process of finding the number of correct answers. Each answer's result is collected in a boolean array; then the true values in this array are counted. A counter variable is incremented with a for...of loop to find the total.

function calculateScore(results: boolean[]): number {
  let score = 0;
  for (const r of results) {
    if (r) score++;
  }
  return score;
}

Counter increment

While calculating the score, the counter is incremented by one when a correct answer is found. The skor++ expression is used; this is the same as skor = skor + 1. At the end of the loop the counter value gives the total number of correct answers.

let score = 0;
if (correct) score++;
// same as score = score + 1

Practice skorHesapla function

Define a skorHesapla function: (sonuclar: boolean[]): number. In its body, start skor at 0, loop over sonuclar with for...of; do skor++ on each true value and finally return skor. Print the result of calling skorHesapla([true, false, true]) with console.log.

Starter code

index.ts
// skorHesapla fonksiyonu tanımla
// boolean[] alıp number dönsün
// for...of ile true'ları say
// skorHesapla([true, false, true]) yazdır

Sample solution

index.ts
function skorHesapla(sonuclar: boolean[]): number {
  let skor = 0;
  for (const s of sonuclar) {
    if (s) skor++;
  }
  return skor;
}
console.log(skorHesapla([true, false, true]));

Expected output

2

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What type of parameter does the score calculation function take?

  • Soru[]
  • string
  • number
  • boolean[] Correct answer

Explanation: Score calculation takes a boolean[] array containing the correct/wrong result of each question and returns a number.

2 Increment counter by one

Question 
let skor = 0;
if (dogru) skor____;
Answer 
let skor = 0;
if (dogru) skor++;

Explanation: To increment a counter by one, the ++ increment operator is used; it is equivalent to skor = skor + 1.

3 Score calculation concepts

Term Meaning
boolean[] Results array
for...of Loop structure
skor++ Counter increment
number Return type

All lessons in Intermediate

1 Classes

  1. Class basics
  2. Constructor and fields
  3. Methods
  4. Static members
  5. Summary - Classes

2 Access modifiers

  1. public
  2. private
  3. protected
  4. Parameter properties
  5. Summary - Access modifiers

3 Readonly properties

  1. readonly fields
  2. Readonly parameter
  3. Readonly vs const
  4. Summary - Readonly

4 Generics

  1. What is a generic?
  2. Generic functions
  3. Generic classes
  4. Multiple type parameters
  5. Summary - Generics

5 Generic constraints

  1. extends constraint
  2. keyof constraint
  3. Default type parameter
  4. Summary - Generic constraints

6 Utility types

  1. Partial
  2. Required and Pick
  3. Omit and Record
  4. Summary - Utility types

7 keyof and typeof

  1. keyof operator
  2. typeof operator
  3. Indexing with keyof
  4. Summary - keyof and typeof

8 Mapped types

  1. What is a mapped type?
  2. Readonly mapped type
  3. Optional mapped type
  4. Summary - Mapped types

9 Conditional types

  1. What is a conditional type?
  2. Distributive conditional
  3. Logic with conditional
  4. Summary - Conditional types

10 infer

  1. infer keyword
  2. Extracting from Promise
  3. Array element type
  4. Summary - infer

11 Decorators

  1. What is a decorator?
  2. Method decorator
  3. Property decorator
  4. Decorator factories
  5. Summary - Decorators

12 Modules

  1. export and import
  2. Default export
  3. Re-export
  4. Type-only import
  5. Summary - Modules

13 Namespaces

  1. What is a namespace?
  2. Nested namespace
  3. Namespace vs module
  4. Summary - Namespaces

14 Declaration files

  1. What is .d.ts?
  2. Ambient module
  3. Triple-slash directive
  4. Summary - Declaration files

15 Advanced classes

  1. abstract class
  2. implements
  3. Get and set
  4. Summary - Advanced classes

16 Type assertion

  1. as keyword
  2. angle bracket syntax
  3. Type assertion vs casting
  4. Casting from unknown
  5. Summary - Type assertion

17 Project: Library package

  1. Package design
  2. Exporting types
  3. Generic helpers
  4. Declaration file
  5. Integration

18 Project: Quiz app

  1. Question model
  2. Question pool
  3. Answer check
  4. Score calculation
  5. Integration

19 Project: Weather app

  1. Weather model
  2. API response type
  3. Data transform
  4. Display
  5. Integration

20 Intermediate final

  1. Challenge 1: Classes
  2. Challenge 2: Generics
  3. Challenge 3: Type systems
  4. Challenge 4: Mini app