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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | 6x 6x 2x 4x 1x 3x 1x 2x 22x 22x 4x 18x 18x | /**
* VocabularyItem Entity
* Represents a single vocabulary word with its translation and usage example.
* This is a core domain entity with no external dependencies.
*/
export interface VocabularyItem {
/** The English word */
word: string
/** Portuguese description/translation */
description: string
/** Usage example in Portuguese */
useCase: string
}
/**
* Factory function to create a VocabularyItem with validation
*/
export function createVocabularyItem(
word: string,
description: string,
useCase: string
): VocabularyItem {
if (!word || word.trim().length === 0) {
throw new Error('Word cannot be empty')
}
if (!description || description.trim().length === 0) {
throw new Error('Description cannot be empty')
}
if (!useCase || useCase.trim().length === 0) {
throw new Error('Use case cannot be empty')
}
return {
word: word.trim(),
description: description.trim(),
useCase: useCase.trim(),
}
}
/**
* Type guard to check if an object is a valid VocabularyItem
*/
export function isVocabularyItem(obj: unknown): obj is VocabularyItem {
if (typeof obj !== 'object' || obj === null) {
return false
}
const item = obj as Record<string, unknown>
return (
typeof item.word === 'string' &&
typeof item.description === 'string' &&
typeof item.useCase === 'string'
)
}
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