How can I check JavaScript arrays for empty strings?

Let’s say the following is our array with non-empty and empty values −

studentDetails[2] = "Smith";
studentDetails[3] = "";
studentDetails[4] = "UK";
function arrayHasEmptyStrings(studentDetails) {
   for (var index = 0; index < studentDetails.length; index++) {

To check arrays for empty strings, the syntax is as follows. Set such condition for checking −

if(yourArrayObjectName[yourCurrentIndexvalue]==””){
   // insert your statement
} else{
   // insert your statement
}

Example

var studentDetails = new Array();
studentDetails[0] = "John";
studentDetails[1] = "";
studentDetails[2] = "Smith";
studentDetails[3] = "";
studentDetails[4] = "UK";
function arrayHasEmptyStrings(studentDetails) {
   for (var index = 0; index < studentDetails.length; index++) {
   if (studentDetails[index] == "")
      console.log("The array has empty strings at the index=" +
      (index));
   else
      console.log("The value is at
      index="+(index)+"="+studentDetails[index]);
   }
}
arrayHasEmptyStrings(studentDetails);

To run the above program, you need to use the following command −

node fileName.js

Here my file name is demo210.js.

Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo210.js
The value is at index=0=John
The array has empty strings at the index=1
The value is at index=2=Smith
The array has empty strings at the index=3
The value is at index=4=UK