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Convert 2D array to object using map or reduce in JavaScript
Let’s say, we have a two-dimensional array that contains some data about the age of some people.
The data is given by the following 2D array
const data = [ ['Rahul',23], ['Vikky',27], ['Sanjay',29], ['Jay',19], ['Dinesh',21], ['Sandeep',45], ['Umesh',32], ['Rohit',28], ];
We are required to write a function that takes in this 2-D array of data and returns an object with key as the first element of each subarray i.e., the string and value as the second element.
We will use the Array.prototype.reduce() method to construct this object, and the code for doing this will be −
Example
const data = [
['Rahul',23],
['Vikky',27],
['Sanjay',29],
['Jay',19],
['Dinesh',21],
['Sandeep',45],
['Umesh',32],
['Rohit',28],
];
const constructObject = arr => {
return arr.reduce((acc, val) => {
const [key, value] = val;
acc[key] = value;
return acc;
}, {});
};
console.log(constructObject(data));Output
The output in the console will be −
{
Rahul: 23,
Vikky: 27,
Sanjay: 29,
Jay: 19,
Dinesh: 21,
Sandeep: 45,
Umesh: 32,
Rohit: 28
}
Updated on: 25-Aug-2020
1K+ Views
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