When should I use VAR or let?
The main difference between the two though is that let deals with block scope whereas var deals with global scope or function scope depending on where it’s declared. As long as your variable isn’t declared within any function, var can be used again anywhere else in your code.
let allows you to declare variables that are limited to the scope of a block statement, or expression on which it is used, unlike the var keyword, which declares a variable globally, or locally to an entire function regardless of block scope.
Where can I use VAR and let?
Due to limited scope let variables are usually used when there is limited use of those variables such as in for loops, while loops or inside the scope of if conditions etc while var variable is used when value of variable need to be less change and used to accessed globally.
Is Let better than VAR?
If you are using ES6+ syntax then no, not really. The let and const declarations provide better scope management than the traditional var. Plus the var keyword may confuse programmers coming from other languages like VB or Java that use var to declare variables, but with different rules.
What’s the difference between VAR and let Swift?
let is used to declare a constant value – you won’t change it after giving it an initial value. var is used to declare a variable value – you could change its value as you wish.
Why is let better than VAR?
let allows you to declare variables that are limited in scope to the block, statement, or expression on which it is used. This is unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.
Why is let safer than VAR?
var does not have a lexical scope; instead, it has a global scope, whereas let has to block scope, which can be implicit or explicit based on the let statement’s placement. … It is no safer to use the type of on the identifiers declared using the let statement, which the case is different for the var declared variables.
What is the difference between const VAR and let?
var declarations are globally scoped or function scoped while let and const are block scoped. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared. They are all hoisted to the top of their scope.
What’s the difference between VAR and let?
Is const faster than let?
It appears that using const would inherently make code a little faster, because it seems to reduce the amount of hoisting necessary. Take the following, basic example: … While it appears trivial, if let and const are actually faster, then that would be a strong argument for consistently using them.