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This article focuses on "what's the difference between stack and heap in JavaScript". Interested friends might as well take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what is the difference between stack and heap in JavaScript"!

Differences: 1, in memory operations, the stack is automatically allocated and released by the operating system, while the heap is allocated and released independently by the developer; 2, in the data structure, the stack is a linear table with limited operations. only one end of the table is allowed to insert and delete operations, while the heap is a priority queue, which will be executed first according to the priority.

The operating environment of this tutorial: windows10 system, javascript1.8.5 version, Dell G3 computer.

What is the difference between stack and heap in JavaScript

When understanding the concepts of heap and stack, it needs to be understood in a specific context. In general, it has two meanings:

(1) in the memory operation scenario, heap and stack represent two memory management modes.

(2) in the data structure scenario, heap and stack represent two commonly used data structures.

1. Memory operation scenario

The stack is automatically allocated and released by the operating system to store simple data segments and occupy a fixed size of space, such as basic data types (Number, String, Boolean... ) and the parameter values of the function, etc.

The heap is allocated and released by the developer independently. If the heap is not released actively, it will be reclaimed by the browser at the end of the program to store the reference type (the variable of the reference type actually holds not the variable itself, but a pointer to the memory space).

Data types in JavaScript

2. Data structure scenario

JavaScript has the concept of stack and queue, which imitates the implementation of stack by array.

Stack: a stack is a linear table with limited operations, which means that inserts and deletions are only allowed at one end of the table, which is called the top of the stack (Top) and the other end is called the bottom of the stack (Bottom). Put the new element on top of the top element of the stack so that it becomes a new top element called Push; remove the top element of the stack so that its adjacent elements become new top elements of the stack called Pop or unstack. The stack is implemented through the push () and pop () methods of the array.

Heap: a heap is actually a priority queue, that is, there is a priority in the queue, for example, there are many tasks to be executed in the queue, which will be executed first according to the priority.

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