TodayILearned- 2023-03-16

#TIL

I did a nice quick review on the difference between var, and let, const:

Var:

• from pre-ES6
• global and function-level scope -> for instance, variables declared with var within a for or if statement has a global scope and can be accessed beyond this block.
• can be redeclared without throwing an error (e.g. using var name twice works)
• var declarations are hoisted (pulled to the top of the script before script is executed) - but var assignments remain in place

Let, const:

• from ES6
• block-level scope (which means that it is limited within the {} blocks)
• redeclarations are not allowed
• not hoisted, so you have to declare the variables using let or const prior to referring to it in the script