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I want to manually construct URL from parts using the URL object.
However, it's constructor requires a proper URL string to be passed to it, which doesn't allow to start from empty object and build it progressively.
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You can use Object. create(null) for a truly empty object (at least according to the mozilla docs: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…)
In your Java program, you can use a String containing this text to create a URL object: URL myURL = new URL("http://example.com/"); The URL object created above represents an absolute URL. An absolute URL contains all of the information necessary to reach the resource in question.
Initialize Typed variable to an Empty Object in TypeScript # Use type assertions to initialize a typed variable to an empty object, e.g. const a1 = {} as Animal; . You can then set the properties on the object using dot or bracket notation.
You have already figured out the workaround and there is no alternative other than passing the parts in or starting with a URL and mutating it.
I'll try to answer:
What caused such design decision in the first place?
By far the most common use case for URLs was to create a URL from a URL string. Someone actually did end up asking for the API you are describing in the URL spec and discussion mostly stalled.
We have an API in Node.js for constructing URLs from parts - but that creates a string one would still need to pass to the URL constructor.
So this is likely not a bad idea and it is currently blocked on someone actually doing the work of adding that capability.
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