I tried using concat but unable to get array like [1,2,66]. By using push I got. But using concat is it possible or what is the reason I am not getting the result.
const arr = [1, 2, 66];
const data = arr.reduce((obj, k) => {
obj.concat(k);
return obj
},[]);
console.log(data);
The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.
So, obj.concat(k) doesn't do anything, and you're returning an unchanged obj in the next line.
To solve this you can assign the concat to a new variable and return that...
const newObj = obj.concat(k);
return newObj;
... or simply return the result of the concat:
return obj.concat(k);
const arr = [1, 2, 66];
const data = arr.reduce((obj, k) => {
return obj.concat(k);
}, []);
console.log(data);
(obj,k) => obj.concat(k) is enough.
concatreturns a new array. It doesn't mutate the current one. So:return obj.concat(k).