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typescript dictionary typing

Different Dove answered on July 7, 2020 Popularity 10/10 Helpfulness 7/10

answer typescript dictionary typing

related typescript Dictionary

typescript dictionary typing

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const dict: { [key: keyType]: valueType};

Popularity 10/10 Helpfulness 7/10 Language typescript

Source: Grepper

Tags: dictionary typescript typing

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Contributed on Jul 07 2020

Different Dove

0 Answers Avg Quality 2/10

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typescript Dictionary

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class Dictionary<T> {
    private items: { [key: string]: T };

    constructor() {
        this.items = {};
    }

    // Method to check if the dictionary contains a key
    has(key: string): boolean {
        return key in this.items;
    }

    // Method to add or update a key-value pair
    set(key: string, value: T): void {
        this.items[key] = value;
    }

    // Method to get the value associated with a key
    get(key: string): T | undefined {
        return this.items[key];
    }

    // Method to remove a key-value pair
    delete(key: string): void {
        if (this.has(key)) {
            delete this.items[key];
        }
    }

    // Method to get all keys
    keys(): string[] {
        return Object.keys(this.items);
    }

    // Method to get all values
    values(): T[] {
        return Object.values(this.items);
    }

    // Method to get all key-value pairs
    entries(): [string, T][] {
        return Object.entries(this.items);
    }

    // Method to clear the dictionary
    clear(): void {
        this.items = {};
    }

    // Method to get the size of the dictionary
    size(): number {
        return Object.keys(this.items).length;
    }

    // Custom getter for [key] syntax
    get [key: string](): T | undefined {
        return this.items[key];
    }

    // Custom setter for [key] syntax
    set [key: string](value: T) {
        this.items[key] = value;
    }
}

// Test the modified Dictionary class
const dict = new Dictionary<number>();
dict.set("a", 1);
dict.set("b", 2);
dict.set("c", 3);

console.log(dict.get("a")); // Output: 1
console.log(dict.keys());   // Output: ["a", "b", "c"]
console.log(dict.values()); // Output: [1, 2, 3]

dict.delete("b");
console.log(dict.keys());   // Output: ["a", "c"]

dict.clear();
console.log(dict.size());   // Output: 0

// Using [key] syntax
dict["x"] = 10;
console.log(dict["x"]);     // Output: 10
console.log(dict["d"]);     // Output: undefined

Popularity 9/10 Helpfulness 4/10 Language typescript

Source: chat.openai.com

Tags: dictionary d

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Contributed on Mar 31 2024

JimmyCat 777

0 Answers Avg Quality 2/10

typescript dictionary typing

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