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Tooling · easy

20. Debugging & Console APIs

Structured logging, breakpoints, and diagnostics.

1 min read3 questionsup to 50 XPtopic 20/50

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AI translates the explanation and quiz text while preserving code and answer scoring.

Use `console.table` for tabulating objects, `console.time`/`console.timeEnd` for benchmarking, and `debugger` to pause in development tools.

js
console.time("rpc");
await fetchBlock();
console.timeEnd("rpc");

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. Which console method displays array objects as a table?

  2. 2. What does the debugger statement do?

  3. 3. How do you measure execution duration quickly?

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