@dancrumb/fpish/dist/utilities.js

FP-friendly classes for Typescript

import { Optional } from "./Optional.js";
/**
 * This is the identity function - it returns whatever you pass in
 *
 * @category Utilities
 */
export const identity = (t) => t;
/**
 * A synonym for {@link identity}
 *
 * @category Utilities
 */
export const asIs = identity;
/**
 * This function returns undefined, whatever you pass in
 *
 * @category Utilities
 */
export const drop = (t) => void undefined;
/**
 * This does the same as {@link drop}, but is typed to return undefined (rather than void)
 *
 * @category Utilities
 */
export const asUndefined = (t) => undefined;
/**
 * Logs an error and moves on
 *
 * @category Utilities
 */
export const logError = (e) => console.error(e);
/**
 * This is a handy utility function that just throws an error
 * that exists in an Either. Useful for Either.apply
 *
 * @category Utilities
 */
export const throwError = (e) => {
    throw e;
};
/**
 * Sometimes, all you're looking to do is extract a single property from and object.
 * That's what this function does
 *
 * @category Utilities
 */
export const extractProperty = (key) => (o) => o[key];
/**
 * Sometimes, you want a subset of an object, with just a few properties
 * That's what this function does
 *
 * @category Utilities
 */
export const pickProperties = (keys) => (o) => {
    return keys.reduce((acc, key) => key in o ? ({ ...acc, [key]: o[key] }) : acc, {});
};
/**
 * Take function that returns a value and make that return an Optional
 *
 * @category Utilities
 */
export const asOptional = (f) => {
    return (...args) => Optional.of(f(...args));
};