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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
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