JsFundamentals

JavaScript édition 2022 (les bases)

Extentions for VS code:

• Live server
• Material Icon Theme
• Monokai ++ (theme)

Javascript data types:

• Number : 1,2,3,100, 3.14
• String : "Hello wolrd" , "Fatima zahra c'est mon prénom"
• Boolean : false , true
• Null : To say that variable is with no value
• Undefined : To say the variable is not yet defined
• Object : Complex data structure, arrays , dates, literals
• Sybmbol : used with object

Primitive & reference types:

Primitive types:

• numbers
• strings
• booleans
• null
• undefined
• symbols

Reference types:

All type of objects:

• object literals
• arrays
• functions
• dates
• all other objects

when we create a primitive type like a string or number and we assign it to a variable, that value is stored on something called the stack which refers to the stack of different values in the memory, and they can be accessed quickly when we need to use them, but the space inside the stack is quite limited, so when we create a reference type like an object literal or array that doesn't stored in the stack but in something else called heap , because the heap has more space available so it can hold bigger and more complex types like objects.

When the primitive value has stored in a variable it adds that value to the stack and it locks the variable name to it as an accessor to that value. When the reference value has stored in a variable like an object , it adds it to the heap, and then it adds a pointer to that object on the stack. Code example is in the object.js file