CodeRunner

Live

const queue = createMessageQueue(driver);
queue.enqueue("also add a changeset");
console.log(queue.size);

Behavior

• ·Attachment is the whole idea: output that floats free of the code that made it is a screenshot.
• ·Re-running replaces the result rather than appending another orphan block.
• ·Pressing play performs a run: the old output clears, the clock restarts from zero, and the result streams back in — the same arrival every time, because every run took time.
• ·The run control disables itself while running — the object states its own availability instead of relying on the user to wait.
• ·Duration sits beside the control, because how long it took is part of the result.

When to use

• ·Executable snippets the user is meant to try, not just read.

When not to

• ·For code that changes files or state — that needs a ReviewableDiff and an explicit apply.
• ·For output with no code behind it; that is a TerminalBlock.