Firstly, I am trying to merge an array of many objects into a single array with every key in each object.
Lastly, any duplicate items in the array should be removed as well as any elements named "name".
Input:
const data = [
{
name: '10/20',
Tyler: 1,
Sonia: 0,
Pedro: 0,
},
{
name: '10/23',
Tyler: 0.5,
Sonia: 0.25,
Pedro: 0.75,
George: 0.5,
},
];
Output:
["Tyler", "Sonia", "Pedro", "George"]
This is what I've tried so far:
const mergedData = data.reduce((prev, cur) => {
const obj = cur[0];
const keys = Object.keys(obj);
const names = keys.splice(1);
return { names };
}, []);
I am trying to capture any key name other than "name" and add it to the final array. However, this is where I get stuck because I get this error, TypeError: Cannot convert undefined or null to object
Note: Objects may be different lengths, contain a mix of names, but never any duplicates.
An option is to find all keys put in a set and remove the name key
const data = [
{
name: '10/20',
Tyler: 1,
Sonia: 0,
Pedro: 0,
},
{
name: '10/23',
Tyler: 0.5,
Sonia: 0.25,
Pedro: 0.75,
George: 0.5,
},
];
const set = new Set(data.reduce((acc, i) => [...acc, ...Object.keys(i)], []));
set.delete('name');
const result = [...set];
console.log(result);If you have access to ES6 methods, you can do this using a Set (unique values are ensured at creation) and converting it back into an array if you want through Destructuring.
data = [{name: '0', Tyler: '1', Dan: '2', Carl: '3'}, {name: '0', Tyler: '1', Dan: '2', Eric: '3', Danny: '4'}];
const output = (data) => {
let output = [];
// This makes sure you get each array and then strips just the keys as desired
data.forEach(item => {
output = output.
concat(Object.keys(item))
});
// This creates the set, strips our dups, and then spreads itself into an array
return [...new Set(output)]
// Strip out the 'name' key as needed
// NOTE: This should be a param instead of hard-coded, but this is easier to show
.filter(res => res != 'name');
}
console.log(output(data));This should be fairly performant considering it only navigates the full array one time and each object itself shouldn't have millions of properties to cause .keys() any issues.