50 lines
1.2 KiB
PHP
50 lines
1.2 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace App;
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use Assert\Assert;
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use Tightenco\Collect\Support\Collection;
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final class GradeSchool
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{
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private Collection $students;
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public function __construct()
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{
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$this->students = new Collection();
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}
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public function addStudentToGrade(string $name, int $grade): void
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{
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Assert::that($name)->notEmpty('Name cannot be blank');
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Assert::that($grade)
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->greaterOrEqualThan(1, 'Grade must be greater than or equal to 1');
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$this->students->push(['name' => $name, 'grade' => $grade]);
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}
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public function getAllStudents(): Collection
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{
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return $this->students->pluck('grade')
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->unique()
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->map(fn (int $grade): Collection => new Collection([
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'grade' => $grade,
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'students' => $this->getStudentsByGrade($grade),
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]))
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->sortBy('grade')
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->values();
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}
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public function getStudentsByGrade(int $grade): Collection
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{
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return $this->students
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->filter(fn (array $student): bool => $grade == $student['grade'])
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->pluck('name')
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->sort()
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->values();
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}
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}
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