'how to replace undefined with a empty string

I am using jsPdf. When a field has been left blank "undefined" is printed on the pdf. I would like to replace that with a empty string. I am trying to use a if statement but I am not getting it.

 doc.text(30, 190, "Budget : $");
    if ($scope.currentItem.JobOriginalBudget == "undefined") {

        doc.text(50, 190, " ");
    }
    else {
        var y = '' + $scope.currentItem.JobOriginalBudget;
        doc.text(50, 190, y);
    };

Solution 1:^[1]

undefined is a primitive value. Instead of comparing against the identifier undefined, you're comparing against the 9-character string "undefined".

Simply remove the quotes:

if ($scope.currentItem.JobOriginalBudget == undefined)

Or compare against the typeof result, which is a string:

if (typeof $scope.currentItem.JobOriginalBudget == "undefined")

Solution 2:^[2]

As per this answer I believe what you want is

doc.text(50, 190, $scope.currentItem.JobOriginalBudget || " ")

Solution 3:^[3]

var ab = {
firstName : undefined,
lastName : undefined
}

let newJSON = JSON.stringify(ab, function (key, value) {return (value === undefined) ? "" : value});

console.log(JSON.parse(newJSON))

<p>
   <b>Before:</b>
   let ab = {
   firstName : undefined,
   lastName : "undefined"
   }
   <br/><br/>
   <b>After:</b>
   View Console
</p>

Solution 4:^[4]

simply remove the "== 'undefined'"

if (!$scope.currentItem.JobOriginalBudget) {
    doc.text(50, 190, " ");
}

Solution 5:^[5]

If item is an Object use, this function :

replaceUndefinied(item) {
   var str =  JSON.stringify(item, function (key, value) {return (value === undefined) ? "" : value});
   return JSON.parse(str);
}

Solution 6:^[6]

In my case

doc.text(50, 190, $scope.currentItem.JobOriginalBudget??"")

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	apsillers
Solution 2	Community
Solution 3	Abdullah
Solution 4
Solution 5	Maxime
Solution 6

'how to replace undefined with a empty string

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]

Solution 6:[6]