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javascript - is there a way to pass undefined.undefined as a function parameter

I want to check if object has a field with value then return default value if it has not..

function testFun(value, defaultvalue) {
  if (!value) {
    console.log(defaultvalue)
  } else {
    console.log(value)
  }
}

let testVar
testFun(testVar, 'this is default vaue')

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1 Answer

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by (71.8m points)

The easiest way that you can do that is by using Optional Chaining

function testFun(value, defaultvalue) {
  if (!value) {
    console.log(defaultvalue)
  } else {
    console.log(value)
  }
}

let testVar
testFun(testVar, testVar?.field1?.value || 'Other default value')

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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