Alexander Karan's Blog

Replace vs Replace All

Oct 19, 20241 min read

Folding Results

Jan 16, 20242 min read

Immutable Updates with "with"

Are you looking to update the value in an array but not change the original? Say hello to with(). The with function allows you to update a value in an array but return a copy with the updated value, not update the original. Pretty simple to use: cons...

Nov 6, 20241 min read

Padding Strings

Sep 5, 20232 min read

What's In My Array

Sep 4, 20232 min read

Testing Array Elements in JavaScript

Using Array.prototype.every() to validate arrays in JavaScript

Aug 28, 20231 min read

Errors in TypeScript

How to extend the error type in TypeScript

Aug 23, 20232 min read

Reversing Arrays in JavaScript

JavaScript has two built-in functions for reversing arrays. The first method is Array.prototype.reverse() which reverses the array in place, meaning we change the original array. const numbers = [5, 10, 15, 20, 25, 30] const reversed = numbers.rever...

Aug 20, 20231 min read

Crafting Error Trails In JavaScript

Using Error.prototype.cause to create better errors

Aug 19, 20232 min read

JavaScript Find Last

We all have used find before on an array, but what if we wanted to start from the end of the array? Well, thanks to findLast you no longer need to perform some weird logic or use an external library to pull this off. In this example, you can see how ...

Aug 19, 20231 min read

Nullish Coalescing Operator

We often use the or operator || in JavaScript to create a fallback value. However, this comes with risks, and you should try to use nullish coalescing operator instead ??. When we use the or operator, it will default to the value provided if the valu...

Aug 17, 20232 min read

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