const vs var

Developers should use const when declaring variables that should not change during execution, such as configuration values, mathematical constants, or references to DOM elements meets developers should learn 'var' primarily for maintaining or understanding legacy javascript codebases, as it was the standard before es6 (2015). Here's our take.

const

Nice Pick

Developers should use const when declaring variables that should not change during execution, such as configuration values, mathematical constants, or references to DOM elements

Pros

• It improves code readability by signaling intent, enhances maintainability by preventing unintended mutations, and can help compilers optimize code
• Related to: javascript, typescript

Cons

• Specific tradeoffs depend on your use case

var

Developers should learn 'var' primarily for maintaining or understanding legacy JavaScript codebases, as it was the standard before ES6 (2015)

Pros

• It's still used in older scripts, tutorials, or environments that don't support modern JavaScript features, but for new projects, alternatives like 'let' and 'const' are recommended due to their block scoping and better error prevention
• Related to: javascript, let-keyword

Cons

• Specific tradeoffs depend on your use case

The Verdict

These tools serve different purposes. const is a concept while var is a language. We picked const based on overall popularity, but your choice depends on what you're building.

The Bottom Line

const wins

Based on overall popularity. const is more widely used, but var excels in its own space.