Cast Prop to Type

This utility provides a straightforward mechanism to cast various types of JavaScript properties to desired data types, such as number, array, boolean, and object. In the event of a casting error or invalid input, a custom ValidationError is thrown to provide a meaningful error message.

Usage

import { castPropToType } from "@frankhoodbs/cast-prop-to-type";

const numValue = castPropToType("42", "number");  // Returns 42 as a number

API

castPropToType(value, type)

Cast the given value to the specified type.

Parameters:

• value (any): The value to be casted.
• type ("number" | "array" | "boolean" | "object"): The type to which the value should be casted.

Returns:

The casted value. Throws ValidationError if casting is not possible.

ValidationError

Custom error that is thrown when there's a validation error during the casting process. It extends the native JavaScript Error class.

Examples

// Casting a string to a number
const num = castPropToType("42", "number"); // 42

// Casting a string to an array
const arr = castPropToType('["a", "b", "c"]', "array"); // ["a", "b", "c"]

// Casting a string to a boolean
const boolTrue = castPropToType("true", "boolean");  // true

// Casting a string to an object
const obj = castPropToType('{"key": "value"}', "object");  // { key: "value" }

Error Handling

If the utility encounters an invalid value for the desired casting type or if the type itself is invalid, a ValidationError will be thrown:

try {
  const num = castPropToType("foo", "number");
} catch (error) {
  if (error instanceof ValidationError) {
    console.error(error.message);
  }
}