Hash Table: TypeScript Implementation with Generics
Key Takeaways
- ✓TypeScript generics make Hash Table reusable across data types.
- ✓Static typing catches errors at compile time rather than runtime.
- ✓The implementation achieves O(1) average complexity.
- ✓TypeScript is ideal for production algorithm implementations.
Hash Table in TypeScript: Overview
TypeScript Implementation
class HashTable<V> {
private buckets: [string, V][][];
private count = 0;
constructor(private capacity = 16) {
this.buckets = Array.from({ length: capacity }, () => []);
}
private hash(key: string): number {
let h = 0;
for (let i = 0; i < key.length; i++) h = (h * 31 + key.charCodeAt(i)) | 0;
return Math.abs(h) % this.capacity;
}
set(key: string, value: V): void {
const idx = this.hash(key);
const existing = this.buckets[idx].findIndex(([k]) => k === key);
if (existing >= 0) { this.buckets[idx][existing] = [key, value]; return; }
this.buckets[idx].push([key, value]);
this.count++;
if (this.count > this.capacity * 0.75) this.resize();
}
get(key: string): V | undefined {
const idx = this.hash(key);
const pair = this.buckets[idx].find(([k]) => k === key);
return pair?.[1];
}
private resize(): void {
const old = this.buckets;
this.capacity *= 2;
this.buckets = Array.from({ length: this.capacity }, () => []);
this.count = 0;
for (const bucket of old) for (const [k, v] of bucket) this.set(k, v);
}
}
const ht = new HashTable<number>();
ht.set("a", 1); ht.set("b", 2);
console.log(ht.get("a")); // 1How the Algorithm Works
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See PlansFrequently Asked Questions
Why use TypeScript for Hash Table?
TypeScript adds type safety, generics, and better IDE support compared to JavaScript. For Hash Table, this means compile-time error checking, reusable generic implementations, and improved code documentation through types. The compiled output performs identically to hand-written JavaScript.
Do generics affect performance in TypeScript?
No, TypeScript generics are erased at compile time and have zero runtime overhead. The generated JavaScript contains no type information, so the performance is identical to an untyped implementation. Generics are purely a development-time tool for safety and documentation.
Can I use Hash Table TypeScript code in React?
Absolutely. TypeScript is the standard for React development, and algorithm implementations can be imported directly into React components or hooks. Ensure the algorithm runs efficiently to avoid blocking the UI thread for large inputs.
How do I handle edge cases in TypeScript Hash Table?
Use TypeScript's strict null checking and union types to handle edge cases explicitly. For example, the function signature can return T[] | null to indicate potential failure, and the compiler forces callers to handle both cases. This prevents null reference errors at runtime.
Is TypeScript Hash Table suitable for production?
Yes, TypeScript is widely used in production systems. The type safety and tooling support make it excellent for maintaining algorithm implementations in large codebases. Companies like Google, Microsoft, and Airbnb use TypeScript in production.
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