Question

How to print a map in Node.js

Answer 1

const mp = new Map();
  
mp.set('a', 1);
mp.set('bb', 2);
mp.set('ccc', 3);
mp.set('dddd', 4);
mp.set('nodejs', 5);
   
console.log([...mp.entries()]);
  
console.log([...mp.keys()]);
  
console.log([...mp.values()]);
   
   
   
   
/*
run:
   
[
  [ 'a', 1 ],
  [ 'bb', 2 ],
  [ 'ccc', 3 ],
  [ 'dddd', 4 ],
  [ 'nodejs', 5 ]
]
[ 'a', 'bb', 'ccc', 'dddd', 'nodejs' ]
[ 1, 2, 3, 4, 5 ]
   
*/

 

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Answer 2

function printMap(value, key) {
    console.log(`Key: ${key}, Value: ${value}`);
}
  
const mp = new Map();
  
mp.set('a', 1);
mp.set('bb', 2);
mp.set('ccc', 3);
mp.set('dddd', 4);
mp.set('nodejs', 5);
   
mp.forEach(printMap);   
   
   
   
   
/*
run:
   
Key: a, Value: 1
Key: bb, Value: 2
Key: ccc, Value: 3
Key: dddd, Value: 4
Key: nodejs, Value: 5
   
*/

 

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