Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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: 20-Nov-2020
159 Views
Advertisements