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JavaScript
by Patrik
JavaScript Variables
Variables are containers for storing data in JavaScript. JavaScript variables can be declared in 4 ways:
- Automatically
-
var: Declares a variable with function scope. It's less commonly used in modern JavaScript due to its potential for scope-related issues. -
let: Declares a variable with block scope, limiting it to the block or statement in which it's defined. It allows reassignment. -
const: Declares a constant variable with block scope. Once assigned, its value cannot be changed.
Choosing between them depends on your needs for variable scope and mutability. const is preferred when you don't intend to change the variable's value, while let is suitable for variables that need to be reassigned. var is generally avoided in modern JavaScript due to its quirks related to scope.
We'll discuss the differences in Scope, Redeclaration, and Hoisting.
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Before the advent of ES6, var declarations ruled. There are issues associated with variables declared with var, though. That is why new ways needed to declare variables to emerge.
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let is now preferred for variable declaration. It's no surprise as it comes as an improvement to var declarations. It also solves the problem with var that we just covered. Let's consider why this is so.
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Variables declared with the const maintain constant values. const declarations share some similarities with let declarations.
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