Question

How to check if a value is not in an array with Node.js

Answer 1

const arr = ['javascript', 'typescript', 'nodejs', 'c', 'python'];
 
if (!arr.includes('c++')) {
    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', 'python'];
 
if (arr.indexOf('c++') === -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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