warch finder

Snow White and the Magic Mirror is a classic fairy tale that has captivated audiences for generations. It tells the story of a beautiful princess, Snow White, who is loved by her father, the king. However, Snow White's stepmother, the evil queen, becomes jealous of her beauty and plots to have her killed. The evil queen orders a hunter to take Snow White into the woods and kill her. But instead of killing her, the hunter takes pity on Snow White and sets her free. Lost and alone in the forest, Snow White stumbles upon a small cottage that belongs to seven dwarfs.

Now that is not to say, that life is stress-free and void of obstacles when we have successfully tossed aside the limitations. But rather the obstacles I navigate are along the path that I am traveling out of sincere passion of where I want to go and what I wish to achieve. Previously the obstacles were more frustrating because I was trying to jam a square peg into a round hole, but that was because I was determined to view myself as a round peg. I finally realized I was a unique curved wooden dowel and not one standard size would fit me.

Previously the obstacles were more frustrating because I was trying to jam a square peg into a round hole, but that was because I was determined to view myself as a round peg. We create our own magic in a variety of ways, but one way that will not draw magic into our lives is living passively waiting for it to just manifest on its own.

Lost and alone in the forest, Snow White stumbles upon a small cottage that belongs to seven dwarfs. The dwarfs take Snow White in and care for her. In return, Snow White becomes their housekeeper and cooks meals for them.

Kyle Shevlin

I recently did a code review for an aspiring developer and instructed them to "get rid of the 'magic values' in their code." It dawned on me that it might not have been obvious what I meant, so I figured I would take a few moments, and paragraphs, to explain.

A "magic value" is a string or number used in a program that is essential to its proper function but provides no context or explanation for why it is what it is. The best explanation is that it "magically" works.

We know that there is no magic in programming, and so we should do our best to remove "magic" from our code so that future you or others understand what we write today more clearly.

Here are some common "magic values" I save as variables in my code.

Time related numbers

Let's say we are comparing two Date s and we want to see if they are within three days of each other. We could do:

function isWithinThreeDays(date1, date2)  const difference = Math.abs(date1 - date2) return difference  259200000 >

Now, you might be clever enough to figure out that 259200000 is the number of milliseconds in three days, but I doubt you would figure it out with a quick glance. Better is:

const DAY_IN_MS = 1000 * 60 * 60 * 24 function isWithinThreeDays(date1, date2)  const difference = Math.abs(date1 - date2) return difference  DAY_IN_MS * 3 >

Now our number isn't so "magic" anymore. It's a lot easier to understand that we're comparing difference with three days worth of milliseconds.

localStorage keys

If I ever have to store something in localStorage for an app, I make sure to turn my storage key into a constant variable. This way I have a single string declared, but a variable I can use over and over and over and know with certainty it will be correct. No typos possible.

const STORAGE_KEY = 'kyleshevlin:theme' const currentTheme = localStorage.getItem(STORAGE_KEY) const updateTheme = theme => localStorage.setItem(STORAGE_KEY, theme)

Regexes

Assuming you are a human, you probably can't read complicated regexes with full comprehension at a glance. Better to give your patterns a really good variable name and use that in your program. Would you rather have:

function isValidEmail(email)  return /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]\.[0-9]\.[0-9]\.[0-9]\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]))$/.test( email.toLowerCase() ) >

// You can even go the extra mile and leave a comment about the pattern // or the URL where you found it: https://stackoverflow.com/questions/46155/how-to-validate-an-email-address-in-javascript const VALID_EMAIL_PATTERN = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]\.[0-9]\.[0-9]\.[0-9]\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]))$/ function isValidEmail(email)  return VALID_EMAIL_PATTERN.test(email.toLowerCase()) >

Summary

Avoid "magic values" in your code. Don't be afraid to pull strings, numbers and more out and give them some context with a great name. It'll prevent bugs in your code from typos, and make your programs easier to understand in the future.

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Meanwhile, the evil queen consults her magic mirror, which she believes is the fairest of them all. But to her dismay, the mirror tells her that Snow White is the fairest. The queen decides to take matters into her own hands and disguises herself as an old woman. She tricks Snow White into biting into a poisoned apple, putting her into a deep sleep that can only be broken by true love's kiss. Thankfully, a prince comes across Snow White's coffin and is instantly charmed by her beauty. He kisses her, awakening her from the curse. Snow White and the prince then live happily ever after, while the evil queen meets her demise. Snow White and the Magic Mirror teaches us valuable lessons about the consequences of jealousy and the power of true love. It shows that true beauty comes from within and that good will always triumph over evil in the end. The story continues to enchant and inspire audiences of all ages, making it a beloved tale that will always have a special place in our hearts..

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