Reference value

🏷️ Javascript

Javascript has 2 kinds of variable types: primitive and refence

When declaring a variable, Javascript engine allocates the memory for them on stack and heap

Static data includes primitive types and reference values to objects. Its size is fixed at compile time. Javascript stores memory space of the static data on the stack

Javascript stores array, object and function on the heap. These objects don’t have fixed amount of memory

Javascript creates a new object on the heap and link the object to the variable on the stack

You can add, change, and delete properties of a reference value

When assigning a primitive value from a variable to another, Javascript creates a copy of that value and assigns it to the new variable. If you change the value of one variable, it won’t affect the other

When assigning a reference value from a variable to another, Javascript create a reference. This means two variables refer to the same object on the heap. If you change one variable, it will affects the other

https://www.javascripttutorial.net/javascript-primitive-vs-reference-values/