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typed-function

Type checking for JavaScript functions

  • 4.2.1
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What is typed-function?

The typed-function npm package allows you to define functions with typed arguments in JavaScript. It provides a way to enforce type checking at runtime, making your code more robust and easier to debug.

What are typed-function's main functionalities?

Define a typed function

This feature allows you to define a function with multiple signatures, each with different types of arguments. The function will execute the appropriate implementation based on the types of the provided arguments.

const typed = require('typed-function');

const add = typed({
  'number, number': function (a, b) {
    return a + b;
  },
  'string, string': function (a, b) {
    return a + b;
  }
});

console.log(add(2, 3)); // 5
console.log(add('Hello, ', 'world!')); // 'Hello, world!'

Type checking

This feature enforces type checking at runtime, throwing an error if the provided arguments do not match any of the defined signatures. This helps catch type-related bugs early in the development process.

const typed = require('typed-function');

const multiply = typed({
  'number, number': function (a, b) {
    return a * b;
  }
});

try {
  console.log(multiply(2, '3')); // Throws an error
} catch (err) {
  console.error(err.message); // 'TypeError: Unexpected type of argument in function multiply (expected: number, actual: string, index: 1)'
}

Default types

This feature allows you to define default types for your function arguments. If no arguments are provided or if they do not match any specific type, the function will fall back to the default implementation.

const typed = require('typed-function');

const greet = typed({
  'string': function (name) {
    return 'Hello, ' + name + '!';
  },
  'any': function () {
    return 'Hello, world!';
  }
});

console.log(greet('Alice')); // 'Hello, Alice!'
console.log(greet()); // 'Hello, world!'

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Package last updated on 05 Jun 2024

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