Question

How to use logical OR assignment (||=) operator in TypeScript

Answer 1

let a = 0;
a ||= 3;
console.log(a);

const b = 0;
//b ||= 8; // invalid assignment to const 'b' 

const c = undefined;
//c ||= 55; // invalid assignment to const 'c' 

 
   
     
     
/*
run:
     
3
     
*/

 

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Answer 2

let s = '';
 
s ||= 'typescript';
 
console.log(s);
 
   
     
     
/*
run:
     
"typescript"
     
*/

 

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