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Use Python’s `enumerate()` to get each list item with a counter. Choose whether that counter represents a zero-based position or a display number starting at 1.
Understand why an earlier true condition wins, and learn to order overlapping conditions so the intended branch runs.
Learn why sets are useful for unique values but not original order, and how to deduplicate with a list while keeping first appearances.
Understand why assigning `list.sort()` gives you `None`, and choose the right pattern for sorting a list in place or making a sorted copy.
Understand Python’s exclusive slice stop, trace a slice through labeled positions, and choose the right boundary to include the final item.
Learn why equal numbers or strings can sometimes be the same object by coincidence, and when to use `==` instead.
See why Python treats the text "False" as a nonempty string, compare it with an actual boolean, and use an explicit conversion for text input.
Learn why Python treats keyboard input as text, how to convert it for arithmetic, and how to handle entries that are not whole numbers.
Choose a Python number type based on whether you need whole values, approximate fractions, or decimal arithmetic with deliberate rounding.
Cancel the previous search with AbortController, recognize expected aborts, and guard rendering so an older response cannot replace newer ones.
Use cleanup that runs after either success or failure, and keep loading separate from the option to retry.
Understand why an unawaited promise can reject outside a synchronous try/catch, and choose a handler that fits your code.
Model loading, empty, success, and error as distinct states so people know whether data is arriving, absent, available, or unavailable.
Learn where to catch a rejected promise, when to let it reach the caller, and how to avoid hiding failures with an unintended fallback.
See how values move between `.then()` handlers, why a missing return produces `undefined`, and how to fix a chain that needs an asynchronous result.
Learn to await each result before the next dependent operation, while starting independent work together to avoid unnecessary waiting.
Learn when sequential `await` calls add unnecessary waiting, how to use `Promise.all` for independent work, and when order really matters.
See what an async function returns, compare it with Promise.resolve, and use await or .then() to consume its result.
Use Promise.all to start independent asynchronous tasks together and collect their results in the same order as the original inputs.
Learn why a custom control may ignore keyboard input, when a native button is simpler, and what a custom interaction needs to add.
Use the `input` event to read a text field’s current value and update a preview as someone types, without waiting for a button click.
Choose one small practice action, give it a clear finish line, and leave yourself a note that makes the next short session easy to start.
Use event delegation: listen on a stable list parent, find the clicked item with `closest()`, and check that the match belongs to the list.
Understand why a saved `querySelectorAll` result stays unchanged, and choose between querying again and handling future clicks through a parent.
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