Question

How to check if array contains empty elements in JavaScript

Answer 1

const arr = ['c', 'javascript', , , null, '', 'c++', false];

if (arr.indexOf(undefined) === -1 && arr.includes(undefined)) {
  	console.log('yes');
} else {
  	console.log("no");
}


  
  
  
/*
run:
  
"yes"
  
*/

 

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Answer 2

const arr = ['c', 'javascript', , , '', 'c++', undefined];

if (arr.indexOf(undefined) === -1 && arr.includes(undefined)) {
  	console.log('yes');
} else {
  	console.log("no");
}

console.log(arr.includes(undefined));
  
  
  
  
/*
run:
  
"no"
true
  
*/

 

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