In this article, we will learn how to make a new object from the specified object where all the keys are in lowercase using JavaScript.
Example: Here, we have converted the upper case to lower case key values.
Input: {RollNo : 1, Mark : 78}
Output: {rollno : 1, mark : 78}
Approach 1: A simple approach is to Extract keys from Object and LowerCase to all keys and make Object with them. For this purpose we use Object.keys( ) to extract keys from the object. And use String.toLowerCase() method to lower case keys and Array.reduce() method to make an object with lower-case strings.
Example: This example shows the above-explained approach.
Javascript
const Student = { RollNo : 1, Mark: 78 };
function Conv( obj , key )
{
obj[key.toLowerCase()] = Student[key];
return Student;
}
function ObjKeys( obj) {
let arr1 = Object.keys(obj);
let ans = {};
for (let i of arr1)
{
Conv(ans,i);
}
return ans;
}
a = ObjKeys(Student);
console.log(a);
|
Output:
{ rollno : 1, mark : 78}
Approach 2: The simplest approach is to convert the Object to an array and make keys lowercase and make objects from a new array. For this purpose, we use Object.entries() to make an array from Object. And we use Array.map() to apply String.toLowerCase() method to all keys. To convert a new array to an Object we use Object.fromEntries().
Example: This example shows the above-explained approach.
Javascript
const employ = { EmpId: 101, Batch: 56 };
let k = Object.entries(employ);
let l = k.map( function (t){
t[0] = t[0].toLowerCase()
return t;
}
);
const a = Object.fromEntries(l)
console.log(a)
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Output:
{ empid : 101, batch : 56 }