Convert ARRAY to OBJECT in javascript
If you’re a JavaScript developer or someone who’s looking to improve their skills, you’ve probably come across the need to convert an array to an object at some point. In this article, we’ll discuss how to achieve this in JavaScript and why it’s a useful skill to have in your toolbox.
What is an array and an object in JavaScript?
Before we dive into the conversion process, let’s briefly define what an array and an object are in JavaScript. An array is a data structure that stores a collection of elements, typically of the same type. It is indexed and can be accessed using numerical indices. On the other hand, an object is a collection of key-value pairs, where each key is a unique identifier for a value.
Converting an array to an object
One common scenario where you might need to convert an array to an object is when you have an array of items and want to create a lookup table for efficient value retrieval. This is where the Array.reduce() method comes in handy.
Here’s a simple example of how to convert an array to an object using the reduce method:
“`javascript
const arr = [
{ id: 1, name: ‘Alice’ },
{ id: 2, name: ‘Bob’ },
{ id: 3, name: ‘Charlie’ }
];
const obj = arr.reduce((acc, cur) => {
acc[cur.id] = cur;
return acc;
}, {});
console.log(obj);
“`
In this example, we start with an empty object as the initial value for the accumulator. We then loop through each item in the array and assign the item to the object using its id as the key. After the reduce operation is completed, we get an object with the ids as keys and the corresponding items as values.
Why is this useful?
Converting an array to an object can be a useful technique in a variety of scenarios. For example, you may want to quickly look up items based on a unique identifier without having to iterate through the entire array each time. This can improve the performance of your code, especially when dealing with large datasets.
Additionally, many JavaScript libraries and frameworks, such as React.js, often expect data to be in the form of objects rather than arrays. Being able to convert between these two data structures can make working with these tools much easier.
Conclusion
In conclusion, knowing how to convert an array to an object in JavaScript is a valuable skill that can come in handy in a wide range of scenarios. The Array.reduce() method is a powerful tool that allows you to achieve this conversion with ease. Whether you’re building web applications, working with libraries like React.js, or just looking to improve your JavaScript skills, understanding how to convert between arrays and objects is a useful skill to have in your repertoire.
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Let newArr = […Object.values(obj)];
//['a', 'b', 'c']
let arr = ['a','b','c']
let obj = arr.reduce((a,it,i)=>{
a[it] = it
return a
},{})
console.log(obj)
//{ a: 'a', b: 'b', c: 'c' }
Using for each loop we can handle it easily
you can use a record for these conversions
logic was simple but code should be readabe i was scared after this short later i understood
const arr = [1, 23, 4, 56, 7];
// convert it into object
const out = arr.reduce((num, crt, i, ar) => {
return { …num, [crt]: crt };
}, {});
console.log(out);
const rev = Object.values(out).reduce((prev, current, index, arr) => {
return […prev, current];
}, []);
console.log(rev);
Ye konsa theme hai??
Aap kaun sa code editor use karte ho. yeah console ki command bhi code mein hi Dikhai ja raha hai ya aap kaise kar rahe ho.
Aap ko subscribe Kar Diya Hai Ab lajmi batana.
const arr=['a','b','c']
let obj = Object.assign({},arr)
console.log(obj);
let array= Object.entries(obj)
console.log(array.flat());
array to object and object to array
ye ek good approch hai ya nahi
Which extension gives results beside code like yours?
Which code editor is this? Kindly share
Love from Bangladesh
big fan
Please add some more video in this playlist, please
var emptyObj= { }
are.forEach((val)=> {
emptyObj[val] = val;
}
console.log(emptyObj);
🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉
Ye sir enteries se bi to ho sakta hain ❤❤
let tab=[]
for (let val in obj){
tab.push(obj[val])
}
console.log(tab2)
Boss kuch samajh mein nahin aya . And funny part is i know programming. Mujhe kuch knowledge hoke agar samajh nahin aya dusre ko kya aega
let arr=["a","b","c"];
let obj={};
for( let i=0 ;i<arr.length ;i++){
let name=arr[i];
if(obj[name]===undefined){
obj[name]=arr[i]
}
}
console.log(obj) i can do like this ???