How to check and replace undefined and zero inside Javascript array map?

Question

Following are the code snippet for the javascript map and join. Here I want to check the object properties and if it contains the undefined then display "" and if the properties contains the zero then display 0. Code is already running but when I see output into the console I did not get the value for undefined and 0. Could some let me know what is the problem into the running code here.

let userInfo = {
  "l_idReference": "205000",
  "l_Name": undefined,
  "l_totalDebitsAch": 1,
  "l_totalCreditsAch": 0,
  "l_totalCreditAmountAch": 0,
  "l_creationDateAndTime": "2019-10-11T00:00:00"
}
checkNullOrZero = (obj) => {
    //console.log(obj ,"OBJ")
    const output =  Object.keys(obj).map(col => {
      if(obj[col] === "" || obj[col] === 0){
        obj[col] = 0
      }
      return `<td>${obj[col] ? obj[col] : ""}</td>`
      
    }).join("")
    console.log(output)
  }
  
checkNullOrZero(userInfo)

Thanks.

obj[col] ? obj[col] : "" will turn any falsy value into an empty string. Since 0 is falsy, it would also be converted into nothing. — VLAZ
– VLAZ, Commented Nov 9, 2019 at 8:19

Ilia Afzali · Accepted Answer · 2019-11-09 08:25:23Z

1

'obj[col] ?' Condition will be false when the obj[col] is equal to zero,

So you should change your condition.

Try this :

  let userInfo = {
      "l_idReference": "205000",
      "l_Name": undefined,
      "l_totalDebitsAch": 1,
      "l_totalCreditsAch": 0,
      "l_totalCreditAmountAch": 0,
      "l_creationDateAndTime": "2019-10-11T00:00:00"
    }
    checkNullOrZero = (obj) => {
        //console.log(obj ,"OBJ")
        const output =  Object.keys(obj).map(col => {
          if(obj[col] === "" || obj[col] === 0){
            obj[col] = 0
          }
          return `<td>${obj[col]!= undefined ? obj[col] : obj[col] == 0 ? "0" : ""}</td>`
          
        }).join("")
        console.log(output)
      }
      
    checkNullOrZero(userInfo)

edited Nov 9, 2019 at 8:25

answered Nov 9, 2019 at 8:21

Ilia Afzali

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1 Comment

Mikkel Over a year ago

The code may be correct, but please add an explanation of how it solves the problem, so that the op can learn from it

Amit Mondal · Accepted Answer · 2019-11-09 08:24:37Z

0

Here you go. Just check for the type undefined of the property.

userInfo = {
  "l_idReference": "205000",
  "l_Name": undefined,
  "l_totalDebitsAch": 1,
  "l_totalCreditsAch": 0,
  "l_totalCreditAmountAch": 0,
  "l_creationDateAndTime": "2019-10-11T00:00:00"
}
checkNullOrZero = (obj) => {
  //     console.log(obj ,"OBJ")
  const output = Object.keys(obj).map(col => {
    if (obj[col] === "" || obj[col] === 0) {
      obj[col] = 0
    }
    if (obj[col] === undefined) {
      obj[col] = `""`
    }
    return `<td>${obj[col]}</td>`

  }).join("")
  console.log(output)
}

checkNullOrZero(userInfo)

answered Nov 9, 2019 at 8:24

Amit Mondal

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