typed-set

Motivation

Unlike Typescript, type checking will be done at runtime.

Difference from the native Set

An array of initial values cannot be passed during initialization.

Installation

Install with npm:

$ npm install --save typed-set

Usage

TypedSet only works with the following function signatures

f(value: any) => boolean

Notice: if the function returns a non-boolean value, the result of the check will be skipped

const TypedSet = require("typed-set");

class TestClass {}

// you can omit validation
let classicSet = new TypedSet();

// you can pass expected type as string for typeof comparison
let stringTypedSet = new TypedSet("string");

// you can pass expected class for instanceof comparison
let classTypedSet = new TypedSet(TestClass);

// you can pass function with type comparison
let anotherStringTypedSet = new TypedSet((value) => typeof value === "string");

// you can pass function with instanceof comparison
let objectTypedSet = new TypedSet((value) => value instanceof TestClass);

// you can pass function with any conditions
let typedSet = new TypedSet((value) => [1, 2, 3].includes(value));

// then use like a classic Set
typedSet.add(1);
typedSet.add(2);
typedSet.add(3);

// and catch Error when incompatible type added
try {
    typedSet.add("some incompatible type");
} catch (e) {
    console.log(e.message); // "Incompatible type of value" 
}

List of predefined TypedSet classes for primitive types

• TypedSet.TypedBigIntSet
• TypedSet.TypedBooleanSet
• TypedSet.TypedFunctionSet
• TypedSet.TypedNumberSet
• TypedSet.TypedStringSet
• TypedSet.TypedSymbolSet

License

The typed-set package is open-sourced software licensed under the MIT license.