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  • Look for recent answers in this thread. In 'modern' javascript, consider using the in operator:'key' in obj ? 'obj has key property' : 'obj does not have key property' ` Commented Aug 23, 2021 at 16:19
  • I’m open to picking a new ‘correct’ answer if you have one in mind that covers the old way as completely as the current one and also addresses more modern options. Commented Aug 24, 2021 at 20:59

lang-js

AltStyle によって変換されたページ (->オリジナル) /