Day 5: Let

locked
  • JairAviles Asked to answer 9 years ago + 0 comments

    The difference is just scoping. var is scoped to the nearest function block (or global if outside a function block), and let is scoped to the nearest enclosing block (or global if outside any block), which can be smaller than a function block.

    Also, just like var, variables declared with let are visible before they are declared in their enclosing block, so the purpose of let statements is only to free up memory when not needed in a certain block.

    https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/let

    Add Reply Preview cancel

    Sorry, you do not have a permission to answer to this question.

    1. Challenge Walkthrough
      Let's walk through this sample challenge and explore the features of the code editor.1 of 6
    2. Review the problem statement
      Each challenge has a problem statement that includes sample inputs and outputs. Some challenges include additional information to help you out.2 of 6
    3. Choose a language
      Select the language you wish to use to solve this challenge.3 of 6
    4. Enter your code
      Code your solution in our custom editor or code in your own environment and upload your solution as a file.4 of 6
    5. Test your code
      You can compile your code and test it for errors and accuracy before submitting.5 of 6
    6. Submit to see results
      When you're ready, submit your solution! Remember, you can go back and refine your code anytime.6 of 6
    1. Check your score