Question

How to convert an array of objects to a map in JavaScript

Answer 1

function printMap(value, key) {
    console.log(`${key}, ${value}`);
}
 
const arr = [
  { id: 1, language: 'javascript' },
  { id: 2, language: 'node.js' },
  { id: 3, language: 'typescript' },
  { id: 4, language: 'php' },
];
 
const mp = new Map(
  arr.map(object => {
        return [object.id, object.language];
  }),
);
 
mp.forEach(printMap);
 
console.log([...mp]);
   
   
   
/*
run:
   
"1, javascript"
"2, node.js"
"3, typescript"
"4, php"
[[1, "javascript"], [2, "node.js"], [3, "typescript"], [4, "php"]]
   
*/

 

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