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How to map an array of objects in JavaScript?


SubhanUllah
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Code sample using the reduce function:

const myArrayOfObjects = [ 
    { myKey: 1, data: 'some data' }, 
    { myKey: 2, data: 'some data' }, 
    { myKey: 3, data: 'some data' }, 
    { myKey: 4, data: 'some data' }, 
    { myKey: 5, data: 'some data' }, 
    { myKey: 6, data: 'some data' }, 
    { myKey: 7, data: 'some data' }, 
]; 
 
const myMap = myArrayOfObjects.reduce( 
    (accumulator, currentObject) => ({ 
        ...accumulator, 
        [currentObject.myKey]: currentObject, 
    }), 
    {} 
); 
 
console.log(myMap); 
 
// output: 
// { 
//     '1': { myKey: 1, data: 'some data' }, 
//     '2': { myKey: 2, data: 'some data' }, 
//     '3': { myKey: 3, data: 'some data' }, 
//     '4': { myKey: 4, data: 'some data' }, 
//     '5': { myKey: 5, data: 'some data' }, 
//     '6': { myKey: 6, data: 'some data' }, 
//     '7': { myKey: 7, data: 'some data' } 
//   } 

Repeated keys will be overwritten, so take into account that if you have repeated keys only the last one will remain.

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