ask:
What is new Set(data)?
chatGPT answered:
`new Set(data)` uses the constructor to create a new Set object, where `data` is an array. Set is a data structure in JavaScript that allows you to store unique values, that is, values that do not repeat.
The function of `new Set(data)` is to pass the elements in the array `data` as parameters to the Set constructor and create a Set object containing only unique values.
For example, for the array `data = [1, 2, 3, 2, 4, 3, 5]`, `new Set(data)` will create a Set object containing only `[1, 2, 3, 4, 5]` These unique values.
By using a Set object, you can easily remove duplicates from an array because Set only holds unique values. In the example, we use the spread operator `...` to unpack the contents of the Set object into a new array, thereby obtaining the result with duplicates removed
ask:
What do you put inside the parentheses of new Set()?
chatGPT answered:
When using the `new Set()` constructor in JavaScript, no parameters can be passed in the brackets, or an iterable object (such as an array) can be passed as its parameter. For example:
1. When no parameters are passed:
const set = new Set();
2. When an iterable object (such as an array) is passed in:
const arr = [1, 2, 3, 3, 4, 5];
const set = new Set(arr);
The above code creates an empty Set object respectively. and a Set object containing array elements. In a Set object, it will hold a unique value, a collection of non-duplicate elements.
ask:
Is new Set(1) OK?
chatGPT answered:
`new Set(1)` is not legal because the argument to the Set constructor should be an iterable object (such as an array, string, etc.), not a single element.
If you want to create a Set object containing only the value 1, you can put it into an array and pass the array as a parameter to the Set constructor, for example:
const set = new Set([1]);This creates a Set object containing a single element, 1.
Summarize:
The new Set() method cannot create numbers directly