Finding unique values in a Javascript Array using Object.fromEntries
Javascript objects act as dictionaries. They can't hold duplicate keys. I think we can turn it into an advantage if we want to find the unique values in an Array.
const arr = ["foo", "bar", "baz", "foo"];
const uniq = (arry) =>
Object.keys(
arr.reduce((obj, key) => Object.assign({}, obj, { [key]: null })
)
)
uniq(arr) // ["foo", "bar", "baz"]
Understandably, this only works for primitive values that can be represented as key keys in a Javascript object.
If you want to compare non-primitive values like functions, objects, and arrays, you can however JSON.stringify the value.