Convert javascript array to object of same keys/values

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In this article we will learn how we can convert javascript array to object of same keys/values in JavaScript.
So, suppose we have an array, [ "australia", "brazil", "USA", "Japan" ]
and now we have to convert it to an Object with same key and value, example { australia : "australia", brazil : "brazil", USA : "USA", japan : "japan" }.
So to convert it into same keys/value pair object we will be using the reduce()
method of javascript.
The
reduce()
method executes a reducer function for each value in an array and return a single value which is the accumulated result.
Convert Array to Object with same key/value pair in JavaScript.
var source = [ "australia", "brazil", "USA", "Japan"];
var obj = source.reduce(function(o, val) { o[val] = val; return o; }, {});
console.log(obj);
OUTPUT :
{
australia: 'australia',
brazil: 'brazil',
USA: 'USA',
Japan: 'Japan'
}
To know other ways to convert array to object read, How to convert an array to object in javascript?
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