Setting Properties on Variable Creation JS C#

Question

C# has a feature that we can set the class instance properties on the element creation (without a constructor). like this:

var Joe = new Person() {
    Age = 36,
    Weight = 83
}

Do we have a similar thing in JS and PHP?

JS something like:

var ActionBox = document.createElement("div") {
    className: "ActionBox"
};

Emiel Zuurbier · Accepted Answer · 2022-04-09 21:34:02Z

2

You can do this by using Object.assign. It copies the properties of the source object and assigns them to the target object and returns the modified target.

var ActionBox = Object.assign(document.createElement("div"), {
    className: "ActionBox"
});

console.log(ActionBox);

edited Apr 9, 2022 at 21:34

answered Apr 9, 2022 at 21:25

Emiel Zuurbier

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2 Comments

Movahhedi Over a year ago

Very well, is it performance-friendly?

Emiel Zuurbier Over a year ago

@Movahhedi That question depends on what you're measuring against; there aren't any alternatives that allow this kind of syntax. But if you're curious you could always check how the benchmark holds up against looping over the object and manually assigning the properties. benchmark

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