åå®å šæ§ã掻çšããŠTypeScriptãããžã§ã¯ãã®ã¿ã¹ã¯ç®¡çãæ¹åããŸããããæ¬ã¬ã€ãã¯ã³ãŒãå質ãã³ã©ãã¬ãŒã·ã§ã³ããããžã§ã¯ãæåã匷åããå®è·µçãªæŠç¥ãæäŸããŸãã
TypeScriptãããžã§ã¯ã管çïŒåå®å šæ§ã«ããã¿ã¹ã¯é£æº
æ¥éã«é²åãããœãããŠã§ã¢éçºã®äžçã«ãããŠã广çãªãããžã§ã¯ã管çã¯æãéèŠã§ããTypeScriptãå©çšãããããžã§ã¯ãã§ã¯ããã®å©ç¹ã¯ã³ãŒãã®æç¢ºãããªãã¡ã¯ã¿ãªã³ã°ã®å®¹æããè¶ ããåå®å šæ§ãã¿ã¹ã¯é£æºãå¹çåããããã®åŒ·åãªã¡ã«ããºã ãæäŸããŸãããã®ããã°èšäºã§ã¯ãTypeScriptã®åã·ã¹ãã ãæŽ»çšããŠã¿ã¹ã¯ç®¡çã匷åããå ŽæãããŒã ã®èŠæš¡ã«é¢ããããããè¯ãã³ã©ãã¬ãŒã·ã§ã³ãä¿é²ãããšã©ãŒãåæžããéçºãµã€ã¯ã«ãå éãããæ¹æ³ãæãäžããŠãããŸãã
ãœãããŠã§ã¢éçºã«ãããã¿ã¹ã¯é£æºã®éèŠæ§
ãœãããŠã§ã¢ãããžã§ã¯ãã®æåã¯ãã·ãŒã ã¬ã¹ãªã¿ã¹ã¯é£æºã«ããã£ãŠããŸããããŒã ã¡ã³ããŒãåèªã®è²¬ä»»ãçè§£ããã¿ã¹ã¯ãæç¢ºã«å®çŸ©ãããŠããã°ãæéå ã«äºç®å ã§çŽåã§ããå¯èœæ§ãåçã«é«ãŸããŸããäžæ¹ã飿ºãäžååã ãšã次ã®ãããªåé¡ãçºçããŸãïŒ
- ãšã©ãŒããã°ã®å¢å
- ã³ãŒãã®ç«¶å
- ãããžã§ã¯ãã®ãã€ã«ã¹ããŒã³ã®é å»¶
- ãªãœãŒã¹ã®ç¡é§
ã¿ã¹ã¯ã®å®çŸ©ãšå²ãåœãŠã«ãããTypeScriptã®æŽ»çš
TypeScriptã®åã·ã¹ãã ã«ãããéçºè ã¯ã¿ã¹ã¯ãæ£ç¢ºã«å®çŸ©ããèªä¿¡ãæã£ãŠå²ãåœãŠãããšãã§ããŸãã以äžã®äŸãèããŠã¿ãŸãããïŒ
1. ã¿ã¹ã¯ã€ã³ã¿ãŒãã§ãŒã¹ã®å®çŸ©
ã€ã³ã¿ãŒãã§ãŒã¹ã䜿çšããŠã¿ã¹ã¯ã®ç¹æ§ã衚çŸãããã®ååã説æãæ åœè ãã¹ããŒã¿ã¹ãæéãç¶²çŸ ããããšãã§ããŸããããã«ãããã¿ã¹ã¯ã®å±æ§ãæ§é åãããæ¹æ³ã§å®çŸ©ã§ããŸããäŸïŒ
interface Task {
id: number;
name: string;
description: string;
assignee: string; // Could be a userId or team member identifier
status: 'to do' | 'in progress' | 'done';
dueDate: Date;
priority: 'high' | 'medium' | 'low';
}
ããã§ãTaskã€ã³ã¿ãŒãã§ãŒã¹ã¯ã¿ã¹ã¯ã®ããããã£ãæå®ããŸããstatusãã£ãŒã«ãã¯ç¹å®ã®æååå€ã«å¶éãããŠãããäžè²«æ§ãä¿èšŒããŸããdueDateã¯DateåãšããŠåä»ããããé©åãªæ¥ä»åŠçãä¿èšŒããŸããpriorityã¯éãããã»ããã«å¶çŽãããææ§ããé¿ããŸãã
2. åå®å šãªã¿ã¹ã¯å²ãåœãŠ
ã¿ã¹ã¯ãå²ãåœãŠãéãTypeScriptã®åãã§ãã¯ããšã©ãŒãé²ããŸããã¿ã¹ã¯ãå²ãåœãŠã颿°ããããšããŸãïŒ
function assignTask(task: Task, assignee: string): Task {
if (!assignee) {
throw new Error('Assignee is required.');
}
if (!task.name) {
throw new Error('Task name is required.');
}
return { ...task, assignee: assignee };
}
const newTask: Task = {
id: 1,
name: 'Implement User Authentication',
description: 'Develop user authentication functionality',
assignee: '', //Initially unassigned
status: 'to do',
dueDate: new Date('2024-12-31'),
priority: 'high',
};
try {
const assignedTask = assignTask(newTask, 'john.doe@example.com');
console.log('Task assigned:', assignedTask);
} catch (error: any) {
console.error('Error assigning task:', error.message);
}
ããããã£ã«ç¡å¹ãªå€ãå²ãåœãŠãããšãããšãTypeScriptã³ã³ãã€ã©ã¯å³åº§ã«ãšã©ãŒãæ€åºãããããæ¬çªç°å¢ã«å°éããã®ãé²ããŸããããã«ããããããã°æéãççž®ãããã³ãŒãã®ä¿¡é Œæ§ãåäžããŸãããŸããtry-catchãããã¯ã䜿çšããããšã§ã倱æããã¿ã¹ã¯ã®å²ãåœãŠãé©åã«åŠçãããã¢ããªã±ãŒã·ã§ã³å šäœãã¯ã©ãã·ã¥ããã®ãé²ããŸãã
3. ã¹ããŒã¿ã¹ç®¡çã®ããã®Enumã®æŽ»çš
Enumã¯ãã¿ã¹ã¯ã®ã¹ããŒã¿ã¹ãã¯ãªãŒã³ãã€åå®å šã«ç®¡çããæ¹æ³ãæäŸããŸããäŸïŒ
enum TaskStatus {
ToDo = 'to do',
InProgress = 'in progress',
Done = 'done',
}
interface Task {
id: number;
name: string;
description: string;
assignee: string; // Could be a userId or team member identifier
status: TaskStatus;
dueDate: Date;
priority: 'high' | 'medium' | 'low';
}
function updateTaskStatus(task: Task, newStatus: TaskStatus): Task {
return { ...task, status: newStatus };
}
let currentTask: Task = {
id: 1,
name: 'Implement User Authentication',
description: 'Develop user authentication functionality',
assignee: 'john.doe@example.com',
status: TaskStatus.ToDo,
dueDate: new Date('2024-12-31'),
priority: 'high',
};
currentTask = updateTaskStatus(currentTask, TaskStatus.InProgress);
console.log(currentTask);
Enumã䜿çšããããšã§ãstatusããããã£ãäºåå®çŸ©ãããå€ïŒToDoãInProgressããŸãã¯DoneïŒããåãä»ããªãããã«ä¿èšŒã§ããŸããããã«ããããããžã§ã¯ãã®è¿œè·¡ãå ±åã«äžå¯æ¬ ãªãã¿ã€ããã¹ãäžæ£ãªå€ã®ãªã¹ã¯ãæé€ãããŸããupdateTaskStatus颿°ã§ã¯ãåå®å
šæ§ã«ãããéçºè
ã誀ã£ãŠã¹ããŒã¿ã¹ã«ç¡å¹ãªæååå€ãå²ãåœãŠãããšãé²ããŸãã
ã³ã©ãã¬ãŒã·ã§ã³ãšã³ãã¥ãã±ãŒã·ã§ã³ã®åŒ·å
TypeScriptã¯ãåè¿°ã®ãã¯ããã¯ãšçµã¿åãããããšã§ãããŒã ã¡ã³ããŒéã®ã³ã©ãã¬ãŒã·ã§ã³ãå€§å¹ ã«åäžãããŸãã
1. ã€ã³ã¿ãŒãã§ãŒã¹ã«ããæç¢ºãªå¥çŽ
ã€ã³ã¿ãŒãã§ãŒã¹ã¯ãã³ãŒãã®ç°ãªãéšåéã®æç¢ºãªå¥çŽãšããŠæ©èœããŸããè€æ°ã®éçºè ãäºãã«ããåãããç°ãªãã³ã³ããŒãã³ãã«åãçµãã§ããå Žåãã€ã³ã¿ãŒãã§ãŒã¹ã¯äº€æãããããŒã¿ãäžè²«ããŠãããäºåå®çŸ©ãããæ§é ã«åŸãããšãä¿èšŒããŸããããã«ããã誀解ãé²ããçµ±ååé¡ã®å¯èœæ§ãæžãããŸããäŸãã°ãããéçºè ãã€ã³ã¿ãŒãã§ãŒã¹ã倿ŽãããšãTypeScriptã¯ãã®ã€ã³ã¿ãŒãã§ãŒã¹ã䜿çšããŠããä»ã®éçºè ã«èŠåããã³ãŒãã®æŽæ°ãä¿ããŸããããã«ãããã³ãŒã倿Žã®ãšã©ãŒãèµ·ããã«ãããªããŸãã
2. èªååãããããã¥ã¡ã³ããŒã·ã§ã³ãšã³ãŒãè£å®
åå®çŸ©ã¯ãèªååãããããã¥ã¡ã³ããŒã·ã§ã³ã«è²¢ç®ããŸããIDEã¯åæ å ±ãæŽ»çšããŠãéçºè ã«ããŒã¿æ§é ã颿°ãã©ã¡ãŒã¿ãæ»ãå€ã®åã«é¢ããæç¢ºãªèª¬æãæäŸã§ããŸããããã«ãããã³ãŒãã®çè§£ãšäœ¿çšã容æã«ãªããå¹çãåäžããæ å ±ãæ¢ãæéãççž®ãããŸããåæ å ±ã«åºã¥ãã³ãŒãè£å®ã®ææ¡ããæåã§ã®ã¿ã€ãã³ã°ã®å¿ èŠæ§ãæå°éã«æãããšã©ãŒãæžããããšã§éçºãå éãããŸãã
3. ããŒã å šäœã®ã¹ã¿ã€ã«ãšæšæº
ã€ã³ã¿ãŒãã§ãŒã¹ãšåãäžè²«ããŠç¢ºç«ãã匷å¶ããããšã§ãTypeScriptã¯ããŒã ãå ±éã®ã³ãŒãã£ã³ã°ã¹ã¿ã€ã«ãšæšæºãéµå®ããã®ã«åœ¹ç«ã¡ãŸãããã®çµ±äžæ§ã«ãããå ŽæãçµæŽã«é¢ä¿ãªããã³ãŒãã¬ãã¥ãŒãã¡ã³ããã³ã¹ãæ°ããããŒã ã¡ã³ããŒã®ãªã³ããŒãã£ã³ã°ãç°¡çŽ åãããŸãã
ã¿ã¹ã¯é£æºã®ããã®é«åºŠãªæŠç¥
åºæ¬ãè¶ ããŠãããã€ãã®é«åºŠãªTypeScriptãã¯ããã¯ãã¿ã¹ã¯é£æºãããã«åŒ·åããããšãã§ããŸãïŒ
1. æè»ãªåã®ããã®ãžã§ããªã¯ã¹
ãžã§ããªã¯ã¹ã䜿çšãããšãç°ãªãåã§åäœããåå©çšå¯èœãªã³ã³ããŒãã³ããäœæã§ããŸããããã¯ãæ§ã ãªããŒã¿åœ¢åŒã䌎ãã¿ã¹ã¯ãæ±ãéã«ç¹ã«äŸ¡å€ããããŸããäŸãã°ãç°ãªãã¿ã€ãã®ã¿ã¹ã¯ããŒã¿ããµããŒãããã¿ã¹ã¯ãªã¹ããåŠçããããã®ãžã§ããªãã¯é¢æ°ãäœæã§ããŸãïŒ
interface Task {
id: number;
name: string;
description: string;
assignee: string;
status: TaskStatus;
dueDate: Date;
priority: 'high' | 'medium' | 'low';
metadata: T; //Generic for extended information
}
// Example of using the generic for different metadatas
const taskWithMetadata: Task<{ version: string; author: string }> = {
id: 1,
name: 'Design Database Schema',
description: 'Create initial database schema',
assignee: 'jane.doe@example.com',
status: TaskStatus.ToDo,
dueDate: new Date('2024-11-15'),
priority: 'high',
metadata: { version: '1.0', author: 'jane.doe@example.com' },
};
const taskWithAnotherMetadata: Task = {
id: 2,
name: 'Implement API endpoint',
description: 'Create API endpoint for user login',
assignee: 'john.doe@example.com',
status: TaskStatus.InProgress,
dueDate: new Date('2024-12-01'),
priority: 'high',
metadata: ['rest', 'authentication', 'typescript'],
};
ãã®äŸã§ã¯ãTaskã€ã³ã¿ãŒãã§ãŒã¹ã¯ãžã§ããªãã¯åTã䜿çšããŠã¡ã¿ããŒã¿ããããã£ãå®çŸ©ããŠããŸããããã«ãããTaskã€ã³ã¿ãŒãã§ãŒã¹ã®ã³ã¢æ§é ã倿Žããããšãªããã¿ã¹ã¯åºæã®è¿œå æ
å ±ãæè»ã«æ ŒçŽã§ããŸããã€ã³ã¹ã¿ã³ã¹åæã«metadataã®åãæå®ã§ããæ©èœã¯ãå¯å€ã®ã¿ã¹ã¯ããŒã¿ãæ±ãå Žåã§ãåå®å
šæ§ãç¶æããããã«äžå¯æ¬ ã§ãã
2. ã¿ã¹ã¯ã®æ¯ãèããé©å¿ãããããã®æ¡ä»¶ä»ãå
æ¡ä»¶ä»ãåã䜿çšãããšãæ¡ä»¶ã«åºã¥ããŠåãå®çŸ©ã§ããã³ãŒãã®é©å¿æ§ãéåžžã«é«ããªããŸããããã¯ãã¿ã¹ã¯ã®èŠä»¶ãç¶æ ã®ããªãšãŒã·ã§ã³ãæ±ãéã«äŸ¿å©ã§ããã¿ã¹ã¯ã®ããããã£ããã®ã¹ããŒã¿ã¹ã«åºã¥ããŠå€åããã·ããªãªãèããŠã¿ãŸãããïŒ
interface Task {
id: number;
name: string;
description: string;
assignee: string;
status: TaskStatus;
dueDate: Date;
priority: 'high' | 'medium' | 'low';
}
interface InProgressTask extends Task {
estimatedCompletionDate: Date;
}
interface DoneTask extends Task {
actualCompletionDate: Date;
}
type TaskWithExtraInfo =
Task extends { status: TaskStatus.InProgress } ? InProgressTask : (Task extends {status: TaskStatus.Done} ? DoneTask : Task);
// Example Usage
const taskInProgress: TaskWithExtraInfo = {
id: 1,
name: 'Test',
description: 'Test the application',
assignee: 'john.doe@example.com',
status: TaskStatus.InProgress,
dueDate: new Date('2024-12-31'),
priority: 'high',
estimatedCompletionDate: new Date('2024-12-25'),
};
const taskDone: TaskWithExtraInfo = {
id: 2,
name: 'Deploy',
description: 'Deploy the application',
assignee: 'john.doe@example.com',
status: TaskStatus.Done,
dueDate: new Date('2024-12-31'),
priority: 'high',
actualCompletionDate: new Date('2024-12-28')
}
ãã®äŸã§ã¯ãTaskWithExtraInfoåã¯åçã«èª¿æŽãããé²è¡äžã®ã¿ã¹ã¯ã«ã¯estimatedCompletionDateããå®äºããã¿ã¹ã¯ã«ã¯actualCompletionDateãå«ã¿ãŸãããã®åã®æè»æ§ã«ãããã³ãŒãã®åé·æ§ãæå°éã«æããããæç¢ºããä¿é²ãããŸãã
3. ã¿ã¹ã¯å€æã®ããã®ãŠãŒãã£ãªãã£å
TypeScriptã¯ãæ¢åã®åã倿ããããã«çµã¿åãããããšãã§ããçµã¿èŸŒã¿ã®ãŠãŒãã£ãªãã£åãæäŸããŸããããã¯ã倿Žãããã¿ã¹ã¯ã¿ã€ããäœæããã®ã«åœ¹ç«ã¡ãŸããäŸãã°ããã¹ãŠã®ã¿ã¹ã¯ããããã£ããªãã·ã§ãã«ã«ããåããã¿ã¹ã¯ããããã£ã®ãµãã»ããã®ã¿ãå«ãåãäœæã§ããŸãïŒ
interface Task {
id: number;
name: string;
description: string;
assignee: string;
status: TaskStatus;
dueDate: Date;
priority: 'high' | 'medium' | 'low';
}
// Creates a type with all properties of Task as optional
type OptionalTask = Partial;
const partialTask: OptionalTask = {
name: 'Review Code',
status: TaskStatus.ToDo,
};
// Creates a type with only the name and status properties from Task
type NameAndStatusTask = Pick;
const nameAndStatusTask: NameAndStatusTask = {
name: 'Refactor Module',
status: TaskStatus.InProgress,
};
ãããã®ãŠãŒãã£ãªãã£åã¯ãã¿ã¹ã¯æ§é ã®ã¹ã³ãŒããšè€éãã管çããã®ã«åœ¹ç«ã¡ãããçŠç¹ãçµã£ãéçºãå¯èœã«ããã¿ã¹ã¯ããŒã¿ã®ãµãã»ããã§ã®äœæ¥ã容æã«ããŸãã
TypeScriptãããžã§ã¯ã管çã®ãã¹ããã©ã¯ãã£ã¹
ã¿ã¹ã¯é£æºã®ããã«TypeScriptã®å©ç¹ãæå€§éã«æŽ»çšããã«ã¯ã以äžã®ãã¹ããã©ã¯ãã£ã¹ãæ€èšããŠãã ããïŒ
1. 匷åãªåã·ã¹ãã ãæ©æã«ç¢ºç«ãã
ãããžã§ã¯ãã®éå§æã«ãã€ã³ã¿ãŒãã§ãŒã¹ãEnumããã®ä»ã®åå®çŸ©ã«æéãæè³ããŠãã ããããã®äºåã®äœæ¥ã¯ããšã©ãŒãé²ããã³ãŒãã®ä¿å®æ§ãåäžãããããšã§ããããžã§ã¯ãã©ã€ããµã€ã¯ã«å šäœã§å©çããããããŸãããããã®åãå æ¬çã§ãããžãã¹ããžãã¯ãæ£ç¢ºã«åæ ããŠããããšã確èªããŠãã ãããåé¡ãçºçãããŸã§åŸ ããªãã§ãã ãããããã¢ã¯ãã£ããªåä»ãã¯ããããžã§ã¯ãæåã®éèŠãªåŽé¢ã§ããæåããåå®çŸ©ãå®è£ ãããã¹ãŠã®ããŒã ã¡ã³ããŒã®æšæºãèšå®ããŸããããããã¹ãŠã®éçºã®ã¬ã€ããšããŠäœ¿çšããŸãããã®ããã¢ã¯ãã£ããªåä»ãã¯ãã³ãŒãã«å¯Ÿããå ±éã®çè§£ãçã¿åºããçç£æ§ã®åäžã«ã€ãªãããŸãã
2. 峿 Œãªåãã§ãã¯ã匷å¶ãã
TypeScriptã³ã³ãã€ã©ã峿 Œãªãªãã·ã§ã³ïŒäŸïŒtsconfig.jsonãã¡ã€ã«å
ã®strict: trueïŒã§èšå®ããŠãã ããããããã®ãªãã·ã§ã³ã¯ãnull/undefinedãã§ãã¯ãæªäœ¿çšã®å€æ°ãªã©ããã峿 Œãªãã§ãã¯ãæå¹ã«ããŸããã³ã³ãã€ã©ã峿 Œã§ããã°ããã»ã©ãéçºäžã«å€ãã®ãšã©ãŒãæ€åºããã³ãŒãå
šäœã®å質ãåäžãããæ¬çªç°å¢ã«å°éããäºæããªããã°ã®æ°ãæžãããŸãããããã®å³æ Œãªèšå®ã«ãããTypeScriptã¯ã³ã³ãã€ã«æã«ãå®è¡æã§ã¯ãªããå¯èœãªéãå€ãã®æœåšçãªãšã©ãŒãæ€åºããããšãä¿èšŒãããŸãã
3. ã³ãŒãã¬ãã¥ãŒã宿œãã
宿çãªã³ãŒãã¬ãã¥ãŒã宿œããŠãåå®çŸ©ãæ£ãã䜿çšãããã³ãŒãããããžã§ã¯ãã®æšæºã«æºæ ããŠããããšã確èªããŠãã ãããã³ãŒãã¬ãã¥ãŒã¯ãæœåšçãªåãšã©ãŒãæ€åºããååçãªè°è«ãéããŠã³ãŒãå質ãåäžããã貎éãªæ©äŒãæäŸããŸããã¬ãã¥ãŒã¯ãŸããããŒã ã¡ã³ããŒéã®ç¥è移転ã®å ŽãæäŸããå šå¡ãåãèªèãä¿ã€ããšãä¿èšŒããŸãã
4. ã¿ã¹ã¯ç®¡çããŒã«ãšã®çµ±å
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