Question

How to check if a value is not in an array with JavaScript

Answer 1

const arr = ['javascript', 'typescript', 'nodejs', 'c'];
 
if (!arr.includes('php')) {
    console.log('value is not in array');
} else {
    console.log('value is in array');
}
 
   
   
   
   
/*
run:
   
"value is not in array"
   
*/

 

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Answer 2

const arr = ['javascript', 'typescript', 'nodejs', 'c'];

if (arr.indexOf('php') === -1) {
  	console.log('value is not in array');
} else {
  	console.log('value is in array');
}

  
  
  
  
/*
run:
  
"value is not in array"
  
*/

 

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