JavaScript is a complex language. If you’re a JavaScript developer at any level, it’s important to understand its foundational concepts. This article tackles 12 concepts that are critical for any JS developer to understand, but in no way represents the full breadth of what a JS developer should know.

1. Value vs. Reference Variable Assignment

Understanding how JavaScript assigns to variables is foundational to writing bug-free JavaScript. If you don’t understand this, you could easily write code that unintentionally changes values.

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