Javascript Property with three dots (...)

Question

I have a problem with code I am supposed to work with. I found a syntax I am not familiar with and I have trouble googling the documentation:

export const Something = class Something {
    constructor(someObject = {}) {
        this.someObject = {...Something.someObjectDefaultAsStaticMethod,...someThing};
    };
// The rest of the class
};

I have problems understanding what the three dots (...) in front of the parameter do. And "dots in parameter javascript" is a bad search term. Can someone help me, maybe tell me what this syntax is actually called or just directly link me to documentation?

Answer 1

That is not ES6 but has only been added in ECMAScript 2018.

It is called "Object Rest/Spread Properties" and is part of the Spread Syntax.