Answers for "javascript es6 check if index exists"

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javascript es6 check if index exists

const currentData = ['a', undefined], index = 1;

if (index in currentData) {
  console.info('exists');
}
// ...vs...
if (typeof currentData[index] !== 'undefined') {
  console.info('exists');
} else {
  console.info('does not exist'); // incorrect!
}

Posted by: Guest on September-24-2021

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