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const are all used to declare variables. Each of these keywords has its specific meaning and behaviour, and they should be used in different situations depending on the requirements of your code.
The main differences between
const are as follows:
varvariable is only accessible within the function in which it is declared.
varvariables can be reassigned and redeclared within their scope.
letvariable is only accessible within the block (such as a
forloop or a
ifstatement) in which it is declared.
letvariables can be reassigned, but they cannot be redeclared within their scope.
constvariables must be assigned a value when declared, and they cannot be reassigned or redeclared within their scope. This makes
In general, it is recommended to use
const whenever possible and only use
let if you need to reassign the value of a variable.
var should be avoided unless you are working with older code that uses
var extensively. Using
let helps to make your code more readable and maintainable, and it can also prevent common mistakes and bugs.
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