What are the differences between const, let, and var in JavaScript?
An example of an AI chatbot conversation about the differences between const, let, and var in JavaScript.
What are the differences between const, let, and var in JavaScript?
In JavaScript, 'var' is function-scoped, while 'let' and 'const' are block-scoped. 'const' is used for constants.
Can you explain what function-scoped and block-scoped mean?
Function-scoped means a variable is accessible within the function it was declared. Block-scoped means it's only accessible within the nearest enclosing block, like an if statement.
Are there any performance differences between them?
Generally, there are no significant performance differences, but using 'let' and 'const' can lead to cleaner, more maintainable code.
When should I use each of them?
Use 'const' for variables that won't change, 'let' for variables that will, and avoid 'var' unless necessary for compatibility.
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