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js remove undefined from object

By Thoughtful TarantulaThoughtful Tarantula on Apr 18, 2020 
Object.keys(obj).forEach(key => obj[key] === undefined && delete obj[key])

Source: stackoverflow.com

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trim undefined keys from object typescript

By jordangarrisonjordangarrison on Feb 03, 2021 
const obj = {
  a: 1,
  b: undefined
}

// pure functional approach without side-effects
const newObject = Object.keys(obj).reduce((acc, key) => {
  const _acc = acc;
  if (obj[key] !== undefined) _acc[key] = obj[key];
  return _acc;
}, {})

console.log(newObject)
// Object {a: 1}

Source: stackoverflow.com

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