While coding, you will notice that there are some things you stumble upon over and over, and normally they beg for that

If you ever need to keep checking for data updates but don’t have WebSocket available in your system, this util lets you do just that. It is great for cases where you upload a file and you want to keep checking if the file is done processing, or you are working with a third-party API like dropbox or uber and you want to keep checking whether the process is complete or the ride has reached the destination.

This is not quite a code solution but a good to know about the Promise API. It is constantly evolving and I used to have a code solution for the now available methods “allSettled”, “race” and “any” but I am glad just to tell you about them instead of sharing a code implementation of them.

This trick is my favorite and I find myself using it a lot when working with React updating states. It simply lets you conditionally insert a key into a spread object by wrapping the condition in parenthesis.

A couple of amazing and very anticipated JavaScript features you must start using right now to solve commonly used hacks when it comes to deep checking object property and dealing with null and undefined values.

I really like using the array “.forEach” method but sometimes I need to quit early or continue to the next loop and don’t want to use the for…loop for it. You can replicate the “continue” statement behavior with an early return but if you want to replicate the “break” behavior you need to use the array “.some” method instead.

I find myself using this a lot when working on something with NodeJs to log objects to the console. The JSON.stringify takes a third parameter that must be a number of spaces to indent the line with. The second parameter can be null but you can use it to handle things like function, Set, Map, and Symbol that the JSON.stringify method does not handle or simply ignores.

The problem with “typeof” is that if you use it for some primitives and function it works great but for array and objects it becomes hard to know the difference since they are both considered “objects”

One thing I love in Python is the range function and I often need it coding in JavaScript. Here is a simple implementation of it that is perfect for for…of loop and whenever you need numbers in a specific range.

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lementing some basic algorithm since it is just no available yet. Recently I wrote code that walked through two strings (lists) slot by sloe doing comparisons and transformations. In a functional language I could have used built-ins like map to do that.

If you have a bunch of asynchronous or normal function that returns a promise that you need to execute one after the other, this utility can help a lot. It takes a list of functions or promises and sequentially resolves them using the array reduce method.

Just need some id? No need to install a new library for that unless you need some more complex ID generators like UUID. Check these options which may be enough to get going. You can start from the current time in milliseconds or a specific Integer and increment, or you can generate an ID from alphanumeric characters.

Sometimes you just need to know if something is empty and depending on what you are checking, you need to use different methods like, checking the length, size, or if it contains any child elements. This util unifies all of that allowing you to check the size of String, Object, Array, Map, and Set.

The thing with class is you can only extend a single other class. With constructor function, you can compose a function using multiple other constructor functions making it much more flexible to work with at times. You do that by either using the .apply or the .call method of the function prototype. You can even extend only parts of the function as well as long as it is an object.

I always tell people, JavaScript classes are just constructor functions and prototypes under the hood. Is not a real concept like in Java. One way to prove it to just use a constructor function to extend a class. It comes in handy for private stuff which in class is weird with the whole “#” thing and it compiles to less code when used with babel or WebPack.

JavaScript is not a strongly typed language and to get that your best solution is TypeScript which I recommend but, sometimes all you need is a simple type check which JavaScript allows you to do with the “typeof” keyword.