Syntax error Iterate through Object keys and manipulate the key values in JavaScript

Iterate through Object keys and manipulate the key values in JavaScript

Suppose, we have an array of objects like this −

const arr = [
   {
      col1: ["a", "b"],
      col2: ["c", "d"]
   },
   {
      col1: ["e", "f"],
      col2: ["g", "h"]
   }
];

We are required to write a JavaScript function that takes in one such array and returns the following output.

const output = [
   {
      col1: "b",
      col2: "d"
   },
   {
      col1: "f",
      col2: "h"
   }
];

Basically, we want to convert the Object keys Value which is an array initially to a single value and that value will be the second element of the Object keys array.

The code for this will be −

const arr = [
   {
      col1: ["a", "b"],
      col2: ["c", "d"]
   },
   {
      col1: ["e", "f"],
      col2: ["g", "h"]
   }
];
const reduceArray = (arr = []) => {
   const res = arr.reduce((s,a) => {
      const obj = {};
      Object.keys(a).map(function(c) {
         obj[c] = a[c][1];
      });
      s.push(obj);
      return s;
   }, []);
   return res;
};
console.log(reduceArray(arr));

And the output in the console will be −

[ { col1: 'b', col2: 'd' }, { col1: 'f', col2: 'h' } ]
Updated on: 2020-11-20T13:19:56+05:30

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