1Easytypes vs interfaces⏱ 35s
What is the key difference between type and interface in TypeScript?
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✍️ Content byMd. Rakibul Islam
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MCQ
Multiple Choice · 8 questions
2Easyany type⏱ 30s
What does the 'any' type do in TypeScript?
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3Easyreturn types⏱ 35s
What is the output type of this TypeScript function?
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typescript
function greet(name: string) {
if (name.length > 5) {
return 'Hello, ' + name;
}
}4Easyoptional properties⏱ 30s
What does the '?' (optional) operator do in a TypeScript interface?
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typescript
interface User {
name: string;
age?: number;
}5Easyunknown vs any⏱ 35s
What is the difference between 'unknown' and 'any' in TypeScript?
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6Easyreadonly⏱ 40s
What does the 'readonly' modifier do in TypeScript?
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typescript
interface Config {
readonly apiUrl: string;
timeout: number;
}
const cfg: Config = { apiUrl: 'https://api.example.com', timeout: 5000 };
cfg.timeout = 3000; // ?
cfg.apiUrl = 'new'; // ?7Easyunion types⏱ 30s
What is a union type in TypeScript?
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typescript
function format(value: string | number): string {
return String(value);
}8Easytype assertions⏱ 35s
What is a type assertion in TypeScript and when should you use it?
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typescript
const input = document.getElementById('name') as HTMLInputElement;
console.log(input.value);