DEV Community

Cover image for Navigating the Symbolic World with is.symbol and is.not_symbol from 'thiis': Unraveling JavaScript Magic
Ivan Karbashevskyi
Ivan Karbashevskyi

Posted on

Navigating the Symbolic World with is.symbol and is.not_symbol from 'thiis': Unraveling JavaScript Magic

JavaScript, like magic, is full of enchanting elements, and symbols are one such mystical feature. Symbols are unique and can be both fascinating and tricky to work with. Fear not! With the magical tools is.symbol and is.not_symbol from the 'thiis' package, you can confidently navigate the symbolic world of JavaScript. In this article, we'll explore these tools through friendly examples, revealing the magic behind symbols.

The Magic of Symbols in JavaScript

Image description

Before we embark on our magical journey, let's understand what symbols are. In JavaScript, symbols are a primitive data type, and each symbol created is unique. They are often used as keys for object properties, adding a touch of magic to your code.

Meet is.symbol - Your Symbolic Guide

Documentation link

Picture yourself in a realm where symbols abound, and you want to identify if a value is indeed a symbol. The is.symbol method acts as your magical guide, confirming whether a value is a symbol or not. Let the magic unfold:

import { is } from 'thiis'; // Import the "is" object from the "thiis" package

const magicalSymbol = Symbol('magic'); // Creating a symbolic value
const result = is.symbol(magicalSymbol);

console.log(result); // true
Enter fullscreen mode Exit fullscreen mode

In this example, we import the "is" object from the "thiis" package and use the is.symbol method to confirm that magicalSymbol is indeed a symbol. As expected, it returns true, unveiling the magic of symbols.

The Journey of Examples

Now, let's embark on a magical journey with six enchanting examples, including one with stream$ and another involving an array.

1. Discovering the Symbolic Secrets

The primary role of is.symbol is to unveil the symbolic nature of a value. It helps you uncover the magic when working with symbols:

import { is } from 'thiis';

const mysteriousSymbol = someFunctionThatMayReturnSymbol();

if (is.symbol(mysteriousSymbol)) {
  // You've discovered the symbolic secret!
} else {
  // Continue your journey with anticipation.
Enter fullscreen mode Exit fullscreen mode

2. Guarding Against Non-Symbols

Conversely, is.not_symbol serves as a guardian against non-symbolic values. It ensures that a value isn't a symbol before proceeding, protecting your magical realm:

import { is } from 'thiis';

const importantValue = someFunctionThatShouldNotBeSymbol();

if (is.not_symbol(importantValue)) {
  // Your guardian prevents non-symbolic mishaps!
} else {
  // Time to explore other magical possibilities.
Enter fullscreen mode Exit fullscreen mode

3. Creating Magical Constants

Symbols are often used to create unique constants. Use is.symbol to validate that a constant is indeed a magical symbol:

import { is } from 'thiis';

const MAGIC_CONSTANT = Symbol('magic_constant');

if (is.symbol(MAGIC_CONSTANT)) {
  // Embrace the magic of your constant!
} else {
  // Handle the non-symbolic scenario gracefully.
Enter fullscreen mode Exit fullscreen mode

4. Magical Stream Filtering

Let's dive into a magical stream scenario with RxJS. Using filter and is.symbol, we can ensure that the stream processes only values that are symbols:

import { is } from 'thiis';
import { from } from 'rxjs';
import { filter } from 'rxjs/operators';

const magicalStream$ = from([42, 'not a symbol', Symbol('magic'), { obj: 'not a symbol' }]);

  .subscribe(value => {
    console.log(value); // Only magical symbols will be part of the stream's tale.
Enter fullscreen mode Exit fullscreen mode

In this example, the filter(is.symbol) ensures that only symbolic values get processed by the magical stream.

5. Enchanting Array Exploration

Arrays are another dimension for is.not_symbol. You can use every() to confirm that all elements are not symbols and some() to check if at least one isn't:

import { is } from 'thiis';

const notSymbolArray = [1, 'not a symbol', true];
const magicalArray = [Symbol('magic'), 'not a symbol', 42];

const allElementsNotSymbol = notSymbolArray.every(is.not_symbol); // true
const someElementsNotSymbol = magicalArray.some(is.not_symbol); // true

Enter fullscreen mode Exit fullscreen mode

Here, allElementsNotSymbol checks if all elements in notSymbolArray are not symbols, and someElementsNotSymbol checks if at least one element in magicalArray is not a symbol.

6. Magical Object Keys

Symbols are often used as unique keys for object properties. Use is.symbol to ensure that a property key is truly magical:

import { is } from 'thiis';

const magicalKey = Symbol('magic_key');
const obj = {
  [magicalKey]: 'Abracadabra!',
  ordinaryKey: 'Just a key',

if (is.symbol(Object.getOwnPropertySymbols(obj)[0])) {
  console.log(obj[magicalKey]); // Unleash the magic of the object property!
} else {
  // Handle the non-symbolic property with grace.
Enter fullscreen mode Exit fullscreen mode

The Magical Adventure Continues

The is.symbol and is.not_symbol methods from the 'thiis' package are your magical companions on your JavaScript journey. They make working with symbols a delightful experience, ensuring your code interacts with these enchanting values precisely as intended. By adding the 'thiis' package to your JavaScript toolkit and exploring its documentation for more tips and examples, you can navigate the symbolic landscape with confidence and a dash of magic.

So, keep coding, and may your JavaScript be filled with enchantment! A special thanks to ChatGPT for making this article a magical experience.

🎗 ChatGPT & DALL·E 3

Top comments (1)

karbashevskyi profile image
Ivan Karbashevskyi

Telegram channel: