When the same expression or computation appears multiple times within a code block, extract it to a variable to improve maintainability and readability. This reduces the risk of inconsistencies when the logic needs to be updated and makes the code’s intent clearer.

Example:

// Before - repeated computation
switch (event.event.type) {
  case 'spanOpen':
    spans.set(event.invocationId + event.spanId, { name: event.event.name });
    break;
  case 'attributes':
    let span = spans.get(event.invocationId + event.spanId);
    break;
}

// After - extract to variable
const spanKey = event.invocationId + event.spanId;
switch (event.event.type) {
  case 'spanOpen':
    spans.set(spanKey, { name: event.event.name });
    break;
  case 'attributes':
    let span = spans.get(spanKey);
    break;
}

This practice also applies to formatting consistency - use clear, readable formats like 10_000 instead of 10000 for large numbers to improve code readability.

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