Question

174

TypeScript hasOwnProperty equivalent

rated 0 times [ 175] [ 1] / answers: 1 / hits: 53402 / 8 Years ago, mon, february 29, 2016, 12:00:00

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?

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ellisw

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answered 8 Years ago anthonyw · Accepted Answer

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.