TypeScript hasOwnProperty equivalent

Question

In JavaScript, if I want to loop through a dictionary and set properties of another dictionary, I'd use something like this:

for (let key in dict) {   if (obj.hasOwnProperty(key)) {     obj[key] = dict[key];   } } 

If obj is a TypeScript object (instance of a class), is there a way to perform the same operation?

Answer 1

If obj is a TypeScript object (instance of a class), is there a way to perform the same operation?

Your JavaScript is valid TypeScript (more). So you can use the same code as it is.

Here is an example:

class Foo{     foo = 123 }  const dict = new Foo(); const obj = {} as Foo;  for (let key in dict) {   if (obj.hasOwnProperty(key)) {     obj[key] = dict[key];   } } 

Note: I would recommend Object.keys(obj).forEach(k=> even for JavaScript, but that is not the question you are asking here.