![]() ![]() The concept of reference (which we just discussed) is what the process of memory releasing/cleaning (aka garbage collection) is based on. Because we are pointing to two different objects, located by two different addresses. ![]() As we know now it is an address of the object, rather than value. However, to prevent this article from bloating, let’s just say that comparison happening by actual value in the variable. ![]() To understand it completely we need to understand how the equals = and the strictly equals = operators work, unfortunately, it is not very trivial. Your variable storing the address, that pointing to the memory where the actual value is stored. And the actual object on the shelf is an object stored in the Heap, referenced by the variable…Įvery time we use the assign (=) operator we are not assigning the value… We are creating a pointer to the memory where the value is stored. The address is stored in the variable, which is stored in the Stack. The short description is a variable name, the shelf number is a memory address. Every time you place something in the compartment you take a piece of paper and write down the number of the compartment and a short description of what is stored there. Each compartment has a label with a unique number on it. Imagine a big bookshelf with multiple compartments. However often it is poorly understood and thus results in occasional surprises and confusions. It indirectly impacts how most of the key operations (such as assignment and equation) work. The referencing concept is a major pillar of the JavaScript memory organization. Variables declared with let, var, const are hoisted, although let and const won’t return undefined. This includes arbitrary objects and functions. Also, references are stored there, we’ll talk about references in a minute. If the engine can calculate the size beforehand, it uses Stack.Īll the primitives like number, boolean, string, Symbol, BigInt, null and undefined always go to the Stack. How does the engine know which one to use? The rule of thumbs is: if the engine is not sure about the size it uses Heap. Heap is bigger and slower, Stack is smaller and faster. Both are managed by the JavaScript Engine, both are for storing runtime data. In JavaScript (similarly to many other languages) there are two main types of memory Stack and Heap. Even in the abstract Computer Science algorithmic department, there’s a measurement for a space complexity. In programming everything requires space. And memory lifecycle, from allocation to release.Īlso, we’ll look through some common memory leaks and how to avoid them. Most of the time you need to put an effort to create a one…īut it wouldn’t be JavaScript if there were no interesting quirks and features hidden behind this area…įurther, we’ll explore JavaScript memory architecture, main concepts and organization. Here’s a variable, here’s another one, no worries at all… Nowadays memory leak is rarely an issue. Indeed, since I stopped writing C++ code I forgot about memory management. This is exactly how we think of memory in JavaScript. Garbage collection is simulating a computer with an infinite amount of memory. The way I perceive memory lifecycle in major modern languages (those that have automatic memory release aka garbage collection). I’ll start this article with a quote that changed the way I think of memory. Don’t forget to subscribe ✉️, so you won’t miss latest news and articles. ![]()
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