Question

How to check if a key exists in a map with JavaScript

Answer 1

const mp = new Map([
  ['javascript', 1],
  ['nodejs', 2],
  ['typescript', 3],
  ['c++', 4],
]);

console.log(mp.has('javascript')); 

console.log(mp.has('php')); 
  
  
  
  
/*
run:
  
true
false
  
*/

 

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