Javascript Interview Question:Convert Array (key,value)of Object to Object

Sample Input:

var input = [

{ key: "foo", val: "bar" },

{ key: "hello", val: "world" },

];

Sample Output:

var output = { foo: 'bar', hello: 'world' }

Solution(1st way):

var arr = [

{ key: "foo", val: "bar" },

{ key: "hello", val: "world" },

];

var result = arr.reduce(function (acc, obj) {

acc[obj.key] = obj.val;

return acc;

}, {});

console.log(result)

Output:

{ foo: 'bar', hello: 'world' }

Solution(2nd Way):

var keyValueObjectArray = [

{ key: "foo", val: "bar" },

{ key: "hello", val: "world" },

];

//array

var keyValueArray = keyValueObjectArray.map((elm) => [elm.key, elm.val]);

//array to map

var keyValueMap = new Map(keyValueArray);

//map to object

var result = {}

for (const [key, value] of keyValueMap) {

result[key] = value

}

console.log(result)

Output:

{ foo: 'bar', hello: 'world' }