Question

How to use logical NOT (!) operator in TypeScript

Answer 1

const a = 5;
const b = -3;
 
console.log(!(a > 0 || b > 0));
  
  
console.log(!(a > 0) || !(b > 0));  
    
    
    
/*
run:
    
false
true 
    
*/

 

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Answer 2

console.log(!true);
console.log(!false);
console.log(!'');
console.log(!'typescript');
console.log(!0);
console.log(!3534);  


    
    
/*
run:
    
false
true
true
false
true 
false 
    
*/

 

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