Today I Learned - Rocky Kev

TIL JS Symbols

POSTED ON:

TAGS: javascript

Symbol, introduced in ECMAScript 2015, is a primitive data type of JavaScript, along with string, number, boolean, null and undefined.

Symbols are almost exclusively used as special keys on objects:

hitchhikersGuide[ Symbol("meaning of life") ]; // 42

You won't encounter direct usage of symbols very often in typical JS programs. They're mostly used in low-level code such as in libraries and frameworks.

reference

Related TILs

Tagged: javascript

TIL what is npm Script

Despite their high usage they are not particularly well optimized and add about 400ms of overhead. In this article we were able to bring that down to ~22ms.

TIL fancy methods to transform Javascript Objects

You can use Object.entries(), Object.keys(), Object.fromEntries()...

TIL how to hide your JS code

ONE THING TO NOTE: Encrypting a script is stronger than obfuscation, both methods are still not adequate to protect secret content. Honestly, I don't think it's worth it on a production site, and instead just go with pure server-side if you want security. But it's fascinating.