Question

How to check if key exists in object with TypeScript

Answer 1

const obj = {
  	typescript: true,
  	php: false,
  	cpp: true,
  	python: false
};
 
console.log("typescript" in obj);
 
   
     
     
/*
run:
     
true
     
*/

 

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Answer 2

const obj = {
  	typescript: true,
  	php: false,
  	cpp: true,
  	python: false
};
 
console.log(obj.go ? "Yes" : "No");
 
   
     
     
/*
run:
     
"No"
     
*/

 

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