004.conditions

Go Conditions

Concept

Conditional logic controls the flow of execution based on boolean states. Go supports standard if/else structures for sequential logic and switch statements for multi-branch, discrete value evaluation or cleaner condition grouping.

References

• https://gobyexample.com/if-else
• https://gobyexample.com/switch
• https://go.dev/tour/flowcontrol/5

Quest

Objective

Implement complex request classification using if/else and a grading system using switch.

Requirements

ClassifyRequest

• Function: ClassifyRequest(age int, hasID bool, balance float64, isVIP bool) string
• Use if, else if, else. Do not use switch.
• Evaluate rules top-to-bottom. Return immediately upon match.
• Rules:
  1. "INVALID": if age <= 0 OR balance < 0.
  2. "REJECTED": if age < 18 OR hasID is false.
  3. "VIP_ACCESS": if isVIP is true AND balance >= 10000.
  4. "STANDARD_ACCESS": if balance >= 1000.
  5. "LIMITED_ACCESS": All other cases.

EvaluateGrade

• Function: EvaluateGrade(score int) string
• Use switch. Do not use if/else.
• Rules:
  1. "INVALID": if score < 0 OR score > 100.
  2. "A": 90–100.
  3. "B": 80–89.
  4. "C": 70–79.
  5. "D": 60–69.
  6. "F": 0–59.

Inputs

• ClassifyRequest: age (int), hasID (bool), balance (float64), isVIP (bool)
• EvaluateGrade: score (int)

Outputs

• Both return a string matching exactly one of the allowed return values defined in requirements (e.g. "VIP_ACCESS", "A").

Examples

• ClassifyRequest(30, true, 15000, true) → "VIP_ACCESS"
• ClassifyRequest(16, true, 100, false) → "REJECTED"
• EvaluateGrade(95) → "A"
• EvaluateGrade(105) → "INVALID"

Testing

To run the tests, execute the following command from the root directory:

go test -v ./quests/004.conditions

Or from the quest directory:

go test -v

Expected output:

=== RUN   TestClassifyRequest
--- PASS: TestClassifyRequest (0.00s)
=== RUN   TestEvaluateGrade
--- PASS: TestEvaluateGrade (0.00s)
PASS