Did you know this about JavaScript?

[fredroloji]

JavaScript is one of those that skipped math class

[ihateorangecat]

typescript : i still remember old days when i was a naughty boy.

[cbspzhz]

Clearly a feature, just like {} + [] equaling 0

[darkpain]

This is called "Type Coercion".

[ezkymos]

If we list all JS strange things we would need kilometers of paper

[joofville]

JavaScript: king of unexpected behaviour

[asdprogram]

The character subtraction technically works in the same way in c since the ascii 3 is represented by number 51 and ascii 1 is represented by number 49 and 51-49 is obviously 2.

[mprasanth]

You can remember this easily. Js can add strings but it cannot subtract strings, so it converts it into number and do the operation. If it cannot convert it into a number while subtracting, it will return NaN.

[marjanek]

Javascript is a toxic partner.. :) I’ve been in love/hate relationship with it for 2 decades 😂 ❤ 💔😭

[gamesandstuff]

Can you use 2 minuses to add the values of the strings?

[minnow]

It’s not that strange, + is overloaded for string concatenation while - is not, so it attempts to coerce the string arguments to numbers.

The quirk is that strings are coerced to numbers at all, I didn’t even know javascript did that. I hate this language

[lynhrt]

Ever tried to convert a single digit char to the number it self in C?

[csangale]

+ has two roles add and concat 🤷 but - has only one substract not weird at all

[naveenvenkateshk]

How to make a developer's life hell 101 - Javascript

[louisdanielmarino]

32 bcuz js consider it as concatenatio if u use + sign to add to strings, 2 bcuz js converts it into number before executing the - operation, note: it only works with the - sign so if u use * or / js will concatenate both string and it will not convert them this is base on what i remember. :)

[claudiu]

Feels like type coercion is the cool party trick to show people who are not familiar with Javascript.

[flyingmindzofficial]

For character, the plus operator is used for concatenation. The subtraction works this way because the ascii numbers of therespective characters are used. Nothing unexpected or weird imho

[shubhranshbhardwaj]

I know this it checks if both are numeric values and give an answer

[aprilmintacpineda]

This is because the plus sign is used as bot string concatenation and number addition. On the other hand, minus is only used as number subtraction.

[ShiloBuff]

I was also curious if it converted it back to string or left it as number. The result is actually a number.