Definition: The word "run_once" refers to a command executed multiple times in a script, often as part of an iteration loop, where each time it runs, it returns true after execution. For example, if the script contains: ```javascript let result = run_once(function() { console.log(1); }); result; ``` The `run_once` function would be called multiple times with different values, but always returning a boolean value `true`.
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