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Replace var with let and const #112

@gitdevjin

Description

@gitdevjin

Description

According to the docs, using var is not recommended, unless it's necessary, It would be useful to replace var in index.js with let or const depending on their scope and usage. And also as it's less error-prone, this change can make the code more robust for the possible future code change.

Task

  • Replace var with let or const in index.js file
  • Updatevar with let or const in README.md file

Supporting Docs and Articles

w3schools variables
Why don’t we use var anymore?

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