Difference Between Let And Const In Javascript
Difference Between Let And Const In Javascript
Let and const are two keyword declarations in JavaScript used to declare variables. The main difference between let and const variables is that let variables can be reassigned to a new value, while const variables cannot be reassigned and remain constant throughout the code. This means that once a variable is declared using const, it cannot be changed or reassigned to a different value. In contrast, let variables allow for reassignment and can be updated with a new value. Another difference is that const variables must be initialized with a value, whereas let variables can be declared without an initial value. Additionally, const variables have block-level scope, meaning they are only accessible within the block they are declared in, while let variables have function-level scope, meaning they are accessible within the entire function they are declared in. Overall, let is used for variables that may change or be reassigned, while const is used for variables that are meant to remain constant throughout the code.
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- let is a keyword used for declaring variables that can be reassigned, while const is used for variables that cannot be reassigned.
- - When using let, the variable can be declared without being assigned a value. However, when using const, the variable must be assigned a value upon declaration.
- - With let, the variable can be declared in the same scope multiple times, but with const, it can only be declared once.
- - let variables are accessible before they are declared, while const variables are not.
- - Variables declared with let can be reassigned at any time, whereas variables declared with const cannot be reassigned.
- - When using let, the variable can be reassigned to a different data type, while const variables can only be assigned a value once and cannot be changed.
- - Variables declared with let have block scope, while const variables have block scope as well as function scope.
- - Variables declared with let can be used in closures, while const variables cannot.
- - let can be used for initialized and uninitialized variables, while const can only be used for initialized variables.
- - const variables are typically used for values that are not expected to change, such as a constant value in a mathematical equation, while let is used for variables that are expected to change.
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