January 2023
Beginner to intermediate
372 pages
8h 47m
Korean
Content preview from 러닝 타입스크립트
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}
class FailureCounter extends GradeCounter {
countGrades(grades: string[]) {
return super.countGrades(grades, "F");
}
}
class AnyFailureChecker extends GradeCounter {
countGrades(grades: string[]) {
//~~~~~~~~~//~~~~~~~~~
// Error: Property 'countGrades' in type 'AnyFailureChecker' is not// Error: Property 'countGrades' in type 'AnyFailureChecker' is not
// assignable to the same property in base type 'GradeCounter'.// assignable to the same property in base type 'GradeCounter'.
// Type '(grades: string[]) => boolean' is not assignable// Type '(grades: string[]) => boolean' is not assignable
// to type '(grades: string[], letter: string) ...