Implement Once

Implement a once function that ensures the provided function is only called once. Subsequent calls should return the result of the first invocation.

Requirements

• The wrapped function should execute only on the first call
• Return the cached result on all subsequent calls
• Preserve this context and arguments on the first call

Example

const initialize = once(() => { console.log('Init!'); return 42; });
initialize(); // logs "Init!", returns 42
initialize(); // returns 42 (no log)